Lig for sponsorship reasons, is the third level in the Turkish football league system.

It was founded in the 2001–02 season with the name of Turkish Second League Category B as a continuation of the then second level division.

It was the second level division in Turkish football since its foundation in 1963–64 until the formation of the new league system in 2001–02.

The play-off winners of the Red and White Group will face each other in a single decisive game on neutral ground to get the last ticket for promotion to the TFF 1.

They form a play-off league (consisting of ten teams) and play a regular season starting with zero points.

The top two teams in each play-off group are promoted to the TFF First League.

The bottom three teams of the classifying groups are relegated to the TFF Third League.

The finalists play a single game to determine the third team to be promoted.