What is the purpose of an altimeter in a rocket?

The purpose of an altimeter in a rocket is to measure the altitude reached during flight. This instrument is crucial for determining how high the rocket ascends before it either deploys a recovery system or reaches its peak altitude. Accurate altitude measurement helps in flight performance analysis, ensures the rocket safely returns to the ground, and assists in gathering data for future launches. Altimeters can use various methods such as barometric pressure changes or GPS signals to provide this information, contributing to the safety and success of the rocket's flight.