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A deed poll (plural: deeds poll) is a legal document binding only to a single person or several persons acting jointly to express an active intention. It is, strictly speaking, not a contract because it binds only one party and expresses an intention instead of a promise.
Use for changing name
The most common use is a name change through a deed of change of name (often referred to simply as a deed poll). Deeds poll are used for this purpose in countries including the United Kingdom, Ireland, Hong Kong and Singapore. In the UK, a deed poll can also be used to change a child's name, as long as everyone with parental responsibility for the child consents to it and the child does not object to it. The child's parents execute the deed poll on the child's behalf. In some other jurisdictions, a person may simply start using a new name without any formal legal process. The usual requirements are that the new name must be used exclusively and that the change must not be made with intent to defraud. In Australia, name change was formerly accomplished by deed poll but now is done by completing a Change of Name form.
The UK government provides a free web-based service for individuals to change name using a deed poll. However, many websites have been established that charge for this service, some of which appear to be from government agencies. However, they no official status. In 2013, The Guardian wrote:
We can reveal that nearly 50,000 people a year are wasting millions paying online companies that promise on Google adverts to "officially change your name". But they are not government agencies, their "official" stamps have no status, they have no special powers to assess or reject deed poll applications, and their deed polls carry no more legal weight than a DIY version you could print yourself for free.— Donna Ferguson, The Guardian, 
Another common use is to partition land into different sections. For example, a piece of land may be partitioned (or carved out) by a deed poll into Section A and the Remaining Portion thereof. This form of deed poll is commonly used in Hong Kong.
A deed poll may also be used (in England and Wales) for clergy of the Church of England to relinquish their holy orders.
Origin of the term
The term "deed", also known in this context as a "specialty", is common to signed written undertakings not supported by consideration: the seal (even if not a literal wax seal but only a notional one referred to by the execution formula, "signed, sealed and delivered", or even merely "executed as a deed") is deemed to be the consideration necessary to support the obligation. "Poll" is an archaic legal term referring to documents with straight edges; these distinguished a deed binding only one person from one affecting more than a single person (an "indenture", so named during the time when such agreements would be written out repeatedly on a single sheet, then the copies separated by being irregularly torn or cut, i.e. "indented", so that each party had a document with corresponding tears, to discourage forgery).