Responses to forum questions travel through a process of suggesting and verifying answers in order to arrive at what is the ultimate goal: getting the author a sound and satisfactory response to their question.
Suggested Answers
When answering a question, you can click suggest as answer to indicate your confidence in the accuracy of your response. This functionality exists on the first response as well as any of the later responses to the thread.
Suggested answers are highlighted within the thread and the author of the question (as well as anyone else who had the question) will be notified that a potential answer has been provided. The author and others who shared the question can then review the answer and, possibly, verify it.
Verified Answers
Any reply (suggested or otherwise) can be verified as an answer by the author of the question (or anyone who also had the question). When you, as author, mark an answer as verified, you are essentially letting the answerer know the value of their response, and communicating that you are satisfied with the answer to the original question.
Other users can vote any answer up or down. If an answer receives at least 5 up votes, it is then marked as a verified answer.
Rejected Answers
The author of the question (and anyone who also had the question) can also reject answers by clicking reject answer below the response. This simply indicates that the answer is not satisfactory and invites others to offer alternative responses.