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A commutator is an alg which is of the form A B A' B'
let me show what that means through an example:
so, your F2L 33 alg is R' D R U' R' D' R U(adding the U in the end because it'll be easier for you to understand)
here, you can split this into (R' D R) (U') (R' D' R) (U)
you see that you're doing one set of moves, then another set of moves, then undoing the first set of moves that you did, then undoing the second set of moves that you did.

A commutator is an alg which is of the form A B A' B'
let me show what that means through an example:
so, your F2L 33 alg is R' D R U' R' D' R U(adding the U in the end because it'll be easier for you to understand)
here, you can split this into (R' D R) (U') (R' D' R) (U)
you see that you're doing one set of moves, then another set of moves, then undoing the first set of moves that you did, then undoing the second set of moves that you did.