Conversation is the verbalization of concepts involving abstractions and concrete objects which make up the world we live in.
A conversation is communication by two or more people, or sometimes with one's self, often on a particular topic. Conversations are the ideal form of communication in some respects, since they allow people with different views of a topic to learn from each other. A speech, on the other hand, is an oral presentation by one person directed at a group.
Those engaging in conversation naturally relate the other speaker's statements to themselves, and insert themselves (or some degree of relation to themselves, ranging from the replier's opinions or points to actual stories about themselves) into their replies. For a successful conversation, the partners must achieve a workable balance of contributions. A successful conversation includes mutually interesting connections between the speakers or things that the speakers know. For this to happen, those engaging in conversation must find a topic on which they both can relate to in some sense.