Difference between cast and convert in sql server?

Both cast and covert serves the same purpose i.e. convert a data type to another.

• Cast

1. Cast is  ANSII Standard
2. Cast cannot be used for Formatting Purposes.
3. Cast cannot convert a datetime to specific format

• Convert

1. Convert is Specific to SQL SERVER
2. Convert can be used for Formatting Purposes.For example Select convert (varchar, datetime, 101)
3. Convert can be used to convert a datetime to specific format

examples:

select convert(varchar(20),getdate(),101)

o/p:10/25/2012

select cast('100abcd' as varchar(20))

o/p:101abcd