Clauses are defined as the words, consisting of a subject and a finite form of a verb. Every complete sentence is made up of at least one clause.
Let us have a look at the sentences below
A Dependent Clause (or subordinate clause) does not make sense by itself because it does not express a complete thought.
“But she still has his old one”. (a dependent clause is a sentence fragment.)
An Independent Clause (or main clause) makes sense by itself because it expresses a complete thought.
Mia bought a new computer. (One independent clause)
Mia bought a new computer, but she still has the old one. (Two independent clauses)