Difference Between Contactors and Relays

What's the difference between a contractor and a relay?
What is the purpose of a contactor or relay?
What is one major difference between a contactor and a control relay?
#relay
#contactor

[@shafiqueahmed8627]

Sir please tell us about job responsibilites of eelctrical site engineer. ?

[@electricalconcept32]

Noted

[@shafiqueahmed8627]

electrical site engineer make shop drawings, now can you tell me is he make shop drawings on his laptop or company provide laptop/ computer present in office? thanks