To say that a game is procedurally generated is effectively to say that its designers randomized its world instead of laying it out by hand. In Daggerfall, for example, the game would autonomously assemble dungeon maps from a wide array of smaller blocks, making each cavern or catacomb's layout unique.
How does procedural generation work in video games?
In video games, it is used to automatically create large amounts of content in a game. Depending on the implementation, advantages of procedural generation can include smaller file sizes, larger amounts of content, and randomness for less predictable gameplay. Procedural generation is a branch of media synthesis.
What does procedurally generated levels mean?
Procedurally generated means that an algorithm was designed to make things instread of having a person do it before hand. This is usually applied to level design for games. What that means is every time you go to a new place in the game, the computer makes that area right then based on a set of rules.