Overview
SQL Server Agent is an important component of SQL Server that allows you to schedule and automate database and server administration tasks. You can configure a process and then have it run on a set schedule, either every day or during off-hours. Depending on the permissions granted to your account, you may be able to see all jobs as well as create your own jobs.
In addition to running the jobs on a set schedule, you can also run the jobs on demand.
Explanation
The SQL Server Agent node can be located in the root node when using Object Explorer. If you expand this node, you will also see other related items to SQL Server Agent.

Additinal Information