Nobody Colles anymore, now we have the Zoom system.
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Joking aside, the Colle system is a specific setup for launching kingside attacks using all of white's pieces. It relies on the signature LSB and often depends on opening a file for an early rook lift.
It's a traditional system from before the time chess got very positional - so in modern-day play there are too many holes and it becomes easy to puncture. Up to level 1500 it's playable because opponents fail the configurational intelligence to bust it before, say, move 15.
Join the Colle group . . .
https://www.chess.com/club/colle-system