A compound sentence is a sentence which consists of two or more clauses coordinated with each other. A clause is part of a sentence which has a subject and a predicate of its own. In a compound sentence the clauses may be connected:
Syndentically, by means of coordinating conjunctions (and, or, else, but, etc.) or conjunctive adverbs (otherwise, however, nevertheless, yet, still, therefore, etc.).
Asyndetically, without a conjunction or conjunctive adverb.
We can distinguish the following types of coordination: