Wikipedia has an article[0], but in general it can probably be thought as a precursor to agile (the article says that agile is a RAD method) in that instead of doing some lengthy pre/planing process you use an iterative approach that adapts to what the users want.
In this particular case Lazarus is a RAD IDE in the sense that it allows quick development and iteration of functional GUIs - Delphi was also like that but at some point Borland/Inprise/CodeGear/Embarcadero/Whoever made it more of a name to use for their products ("RAD Studio") than something that describes them.
Rapid Application Development :-P.
Wikipedia has an article[0], but in general it can probably be thought as a precursor to agile (the article says that agile is a RAD method) in that instead of doing some lengthy pre/planing process you use an iterative approach that adapts to what the users want.
In this particular case Lazarus is a RAD IDE in the sense that it allows quick development and iteration of functional GUIs - Delphi was also like that but at some point Borland/Inprise/CodeGear/Embarcadero/Whoever made it more of a name to use for their products ("RAD Studio") than something that describes them.
[0] https://en.wikipedia.org/wiki/Rapid_application_development