Telecom Question:

Collision domain is the group of hosts in which collision
can occur but broadcast domain consists of all the groups of
hosts that can proceed the broadcast frame. Broadcast domain
may be collision domain but Collision domain may not be
broadcast domain

A collision domain is an Ethernet term used to descrbe a
network,collection of devices in which one particular
device sends a packet on a network segment.
A broadcast domaun is where a set of all device on that
same segment hear all broadcasts sent on that segment.