Acronym: Lesser General Public License
Similar to the GPL License, typically affecting libraries. Linking your application with an LGPL'd library does not require you to make the source of your application available - something required in the stronger GPL license.
Quote from Web site: "You can use it too, but we suggest you first think carefully about whether this license or the ordinary General Public License is the better strategy to use in any particular case, based on the explanations below. (read more)"