Google described Google Labs as "a playground where our more adventurous users can play around with prototypes of some of our wild and crazy ideas and offer feedback directly to the engineers who developed them."
Google also used an invitation-only model for users to test Labs products including Gmail, Google Calendar and Google Wave, and many of these also have their own "Labs" experimental features and previews. Labs was later removed from Google Calendar.
In July 2011, Google announced that it was discontinuing Google Labs.
Many of the experiments have been discontinued, although a few have moved to the main search pages or have been integrated into other products. Google still has many links to its defunct "Labs" tools in Google blogs that are readily accessible through a Google search.