Last 5 Edges Permute, often abbreviated L5EP, is a 3x3 subset that solves the 4 U-layer edges and the down-front edge simultaneously while preserving all other pieces.
There are 16 algorithms for L5EP, 10 excluding mirrors and 7 excluding mirrors and EPLL.
Any case can be simplified to an EPLL by moving the DF edge into the front and inserting it with M' U2 M. Intuitive L5EP can be used, but it is recommended to learn algorithmic L5EP due to the faster execution and low number of algorithms.
Although it is generally agreed upon that L5EP permutes the four U layer edges, the location of the fifth edge is not always clear. Because of that, multiple variants exist:
Standard L5EP (L5EP-DF): This is the original proposal by Kenneth Gustavsson where the UF, UR, UB, UL and DF edges are permuted simultaneously.
Zipper L5EP (L5EP-FR & L5EP-BR): This variant is used in the Zipper Method and permutes the U layer edges and either the FR or BR edge.