Programmer Humor

Propely done Agile is more to solve the "We have the general idea of what we need but will only know for sure the details of how it will work once the users see it and start playing around with it".

You still need to upfront know that a wedding is actually needed, but have a process for figuring out and trying out the details of the various elements of it (say, as part of deciding what kind of food will there be for the reception, actually preparing and trying various options) before the whole things actually gets "delivered".

Agile also works well for environments were software is developed to serve the kind of business which is are constantly changing (for example, certain areas of Finance) or is something totally new being created from the ground up (i.e. many if not most Startups) because the business itself is a sort of a neverending "we'll figure out what we need and if it works well when we get there and try it out" which matches almost perfectly the fast and scope-limited definition->implementation->feedback cycles of the Agile software development process.