Final answer:
An independent clause makes a complete statement and can stand alone as a sentence. Subordinate clauses are not followed by a period when standing alone. Subordinate clauses can be used as adjectives supporting the idea of the independent clause.
Step-by-step explanation:
An independent clause, or main clause, makes a complete statement and can stand alone as a sentence. Both an independent clause and a subordinate clause, when standing alone, are followed by a period to end the sentence. A subordinate clause can be used as an adjective, modifying or describing the idea of the independent clause it modifies.