Turns

A turn in a race track can be tactically seen as having 3 parts, entry, apex and exit.

Also before the entry to a sharp turn is a place where drivers usually slow down, that is referred to as the braking zone.

Braking Zone
Drivers are expected to brake in a straight line and not change lane in this zone to prevent collisions, and to be predictable for drivers seeking to overtake.

Entry
Where the track starts to turn.

Apex
The middle inner part of a turn.

Exit
Where drivers start to accelerate again.