A ticket can go through various phases throughout its lifecycle. Typically when a ticket first comes in, its status is New. Once an agent answers the ticket, its status is changed to Answered. If a customer replies back to the same ticket, its status is changed to Open. After that, an agent can either answer the ticket again (and same process continues) or simply resolve the ticket and the status will be changed to Resolved.
All actions associated with a ticket are marked with a timestamp in the ticket thread. Keeping track of these timestamps can be very useful, especially if you need to access your online ticket history. This is why it is important to choose a ticket support software that offers detailed ticket tracking and reporting.