what is a clause?
A clause is a group of words containing a subject and a verb. There are broadly two types of clauses:
1. Those that can stand alone and make their meaning clear. These are called Independent clauses.
2. Those that cannot stand alone and make complete sense. These are called dependent clauses.
Example:
My mother was cooking food when my father entered.
Here, "My mother was cooking food" is an independent clause.
"when my father entered" is a dependent clause as it does not make complete sense independently.