Generally Switch and bridge are having the same 
functionality in the network but there is one major 
difference between switch and bridge.
Bridge maximum 16 ports are available
Switch - Maximum 100 ports are available

Fram of switch is software in Bridg,Hardwar (ASIC) in switch
Bridge is connected into a network it segemted into two.in 
this the signle collsion domain comw to two.

Generally, a bridge has only two ports and divides a 
collision domain into two parts. All decisions made by a 
bridge are based on MAC or Layer 2 addressing and do not 
affect the logical or Layer 3 addressing. Thus, a bridge 
will divide a collision domain but has no effect on a 
logical or broadcast domain. No matter how many bridges are 
in a network, unless there is a device such as a router 
that works on Layer 3 addressing, the entire network will 
share the same logical broadcast address space. A bridge 
will create more collision domains but will not add 
broadcast domains 

A switch is essentially a fast, multi-port bridge, which 
can contain dozens of ports. Rather than creating two 
collision domains, each port creates its own collision 
domain. In a network of twenty nodes, twenty collision 
domains exist if each node is plugged into its own switch 
port. If an uplink port is included, one switch creates 
twenty-one single-node collision domains. A switch 
dynamically builds and maintains a Content-Addressable 
Memory (CAM) table, holding all of the necessary MAC 
information for each port