Four main DIFFERENCE between TMAP and tJoin?
Below are the four main difference between tMap and tJoin. And there is a common thing in between TWO of this are tJoin or tMap can both be used to create a join between different data sources.
(1)tMap:-Here we can filter data using filter expressions.
(1)tJoin:-Here we can not filter data using tJoin command.

(2)tMap:-This will supports multiple TYPES of join MODELS and example of these are unique join, first join and all joins.
(2)tJoin:-This will only supports unique join.

(3)tMap:-tMap can have more than one output links.
(3)tJoin:-tJoin can have only two output links and example are(main and reject)

(4)tMap:-tMap can accept only two input links and example are main and lookup.
(4)tJoin:-tJoin can accept multiple input links and example are one is main and rest are lookups.