Control Points (5)

Standard Control Point, also known as Linear or Symmetric Control Point, maps play symmetrically. Both teams start with an equal number of two controlled points and a central point that starts out controlled by neither team. The team that captures all the points wins. In standard Control Point maps, control points must be taken in an unbroken line (thus the "linear" in Linear Control Point). At the beginning of the round, each team's control points are locked while the center point is unlocked and can be taken. Once a team takes the center point, the opponent's nearest point unlocks and can now be taken as well. From then on, no more than two points can be unlocked at a time; taking a point locks the point behind it and unlocks the one in front of it if it exists. Control points close to a team's spawn point are captured more quickly by the enemy team.

Copied from the official TF2 wiki.