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A long-distance relationship (LDR) or a "long-distance romantic relationship" (LDRR) is typically an intimate relationship that takes place when the partners are separated by a considerable distance. Partners in LDRs face geographic separation and lack of face-to-face contact. LDRs are particularly prevalent among college students- constituting 25% to 50% of all LDRs. Even though scholars have reported a signiﬁcant number of LDRRs in undergraduate populations, long-distance relationships continue to be an ‘understudied’ phenomenon.
Characteristics of LDRs 
LDRs are qualitatively different from geographically close relationships; that is, relationships in which the partners are able to see each other, face-to-face, most days. According to Rohlfing (1995) he suggests the following unique challenges for those in long distance relationships:
- Increased financial burdens to maintain relationships
- Difficulty maintaining geographically close friendships while in long-distance romantic relationships
- Difficulty judging the state of a relationship from a distance
- High expectations by partners for the quality of limited face-to-face meetings in the relationship.
LDRs with Friends and Family 
Not all long-distance relationships are romantic. When individuals go away to school their relationships with family and friends also become long distance. Pew Internet (2004) asserts that 79% of adult respondents from the United States reported using the Internet for communication with family and friends. Also, Pew Internet (2002a) states that because of new technologies, college students will have greater social ties with their friends than their family members. Therefore, examining email among college students helps explore how the Internet is affecting college students emotionally and socially. 
In the United States 
Long distance relationships are becoming increasingly common in the United States. In 2005, according to The Center for the Study of Long Distance Relationships, an estimated 2.9% of marriages in the United States were considered long-distance, with 1 in 10 marriages reported to have included a period at long distance within the first 3 years. This means that in 2005 approximately 3.5 million people in the US alone were involved in long-distance marriages. It is harder to know how many non-married couples are in a long-distance relationship but according to The Center for the Study of Long Distance Relationships there was an estimated 4 to 4.5 million college couples in the US which were in non-marital LDRs.
Ways to stay connected 
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New communication technologies such as cellular phone plans make communication among individuals at a distance easier than in the past. Such technologies also create new communication opportunities. Before the popularity of internet dating, long-distance relationships were not as common, as the primary forms of communication between the romance lovers usually involved either telephone conversations or corresponding via mail. According to Pew Internet, American citizens were asked how often they used the Internet on a typical day, they reported 56% sending or reading email, 10% reported sending instant messages, and 9% reported using an online social network such as Facebook.  However, with the advent of the Internet, long-distance relationships have exploded in popularity as they become less challenging to sustain with the use of modern technology.
Couples who have a routine, strategic relational maintenance behaviors, and take advantage of social media can help maintain a Long-Distance relationship. Having positivity (making interactions cheerful and pleasant), openness (directly discussing the relationship and one's feelings), assurances (reassuring the partner about the relationship and the future), network (relying on support and love of others), shared tasks (performing common tasks) and conflict management (giving the partner advice) are some of the routine and strategic relation maintenance behaviors 
In a study of jealousy experience, expression, in LDR's, 114 individuals who were in LDR's indicated how much face-to-face contact they had during a typical week. Thirty-three percent of participants reported no face-to-face contact, whereas 67% reported periodic face-to-face contact with a mean of 1 to 2 days.  The researchers compared LDRs to GCRs (geographically close relationships) and discovered that those in LDRs with no face-to-face contact experience more jealousy than those with periodic face-to-face contact or those in GCRs. Furthermore, those without periodic face-to-face contact were more likely to use the Internet to communicate with their partner. They found that the presence of periodic face-to-face contact is a crucial factor in the satisfaction, commitment, and trust of LDR partners. Those who do not experience periodic face-to-face contact reported significantly lower levels of satisfaction, commitment, and trust.
Another study generated a sample of 335 undergraduate students who were in LDRs and became geographically close.  Of the reunited couples, 66 individuals terminated their relationships after moving to the same location, whereas 114 continued their relationship.
Based on the analysis of the open-ended responses, 97% of respondents noted some type of relationship change associated with the LD-GC (geographically close) transition. When the respondents were asked about having the ability to more face-to-face time when GC, and the enjoyment of increased time spent together most comments were positive. For example, ‘We ﬁnally got to do all the “little” things we’d been wanting to do for so long; we get to hold each other, wake up next to each other, eat together, etc.’ Many Individuals reported a loss of autonomy, following reunion. For example, many individuals liked and missed the “freedom” or “privacy” the distance allowed. Reports of “nagging”, demanding or expecting “too much” were also frequent responses. Several individuals reported more conﬂict and ‘ﬁghting’ in their relationship after it became geographically close. Many said they felt the conﬂict in their relationship was not only more frequent but also more difﬁcult to resolve. For example, one individual stated that, when his relationship was long distance, he and his partner ‘fought less and if we did ﬁght, problems were solved in a shorter amount of time. For some individuals living in the same location led to increased feelings of jealousy. After witnessing their partners’ behaviour, some participants said that they became increasingly concerned that their partners were currently ‘cheating’ on them or had ‘cheated on them in the past.’ Reunion allowed the discovery of positive as well as negative characteristics about their partner, feeling that the partner had changed in some way since the relationship was long distance.
See also 
- Maguire, Katheryn C.; Terry A. Kinney (February 2010). "When Distance is Problematic: Communication, Coping, and Relational Satisfaction in Female College Students’ Long-Distance Dating Relationships". Journal of Applied Communication Research 38 (1): 27–46.
- (Rholfing, 1995)
- "The Internet and daily life: Many Americans use the Internet in everyday activities, but traditional ofﬂine habits still dominate".
- "The Internet goes to college: How students are living in the future with today’s technology".
- Long Distance Relationships Statistics
- Johnson, A.; Haigh, M., Becker, J., Craig, E., & Wigley, S (2008). "College Students Use of Relational Management Strategies in Email in Long-Distance and Geographically Close Relationships". Journal of Computer-Mediated Communication 13 (2): 381–404.
- Sidelinger, R.; Ayash, G., Godorhazy, A., & Tibbles, D. (2008). "Couples Go Online: Relational Maintenance Behaviors and Relational Characteristics Use in Dating Relationships". Human Communication.
- Aylor, B; Dainton M. (2002). "Patterns of Communication channel use in the maintenance of long-distance relationships". Communication Research Reports 19: 118–129.
- Stafford, Laura; Andy J. Merolla, & Janessa D. Castle (2006). "When long-distance dating partners become geographically close". Journal of Social and Personal Relationships 23 (6): 901–919.
- Chris Bell, Kate Brauer-Bell, The Long-Distance Relationship Survival Guide (New York: Ten Speed Press, 2006)
- Seetha Narayan, The Complete Idiot's Guide to Long-Distance Relationships (Alpha Books: 2005)
- Rohlﬁng, M. E. (1995). Doesn’t anyone stay in one place anymore?’’ An exploration of the understudied phenomenon of long-distance relationships. In J. Woods & S. Duck (Eds.), Understudied relationships: Off the beaten track (pp. 173�196). Thousand Oaks, CA: Sage
- Pew Internet & American Life Project. (2002a). The Internet goes to college: How students are living in the future with today’s technology. Retrieved October 15, 2005, from http://www.pewInternet.org/pdfs/PIP_College_Report.pdf
- Pew Internet & American Life Project (2004). The Internet and daily life: Many Americans use the Internet in everyday activities, but traditional ofﬂine habits still dominate. Retrieved October 11, 2007 from http://www.pewInternet.org/PPF/r/131/report_display.asp