What is the difference between a Booster and a Repeater

Repeater and booster are mostly the same thing, Devices to improve signals coverage,  while repeaters are used in Distributed Antenna Systems (DAS) to provide wireless coverage to a specified area.

Out-Door and In-Door Distributed Antenna Systems have become a critical part of both carrier cell phone networks and enterprise infrastructure.

A DAS is a network of antennas that sends and receives cellular signals on a carrier’s licensed frequencies, thereby improving voice and data connectivity for end-users.