To employ means to use something or hire someone to work. You can employ a saw to cut a board or employ a tutor to teach you math. You can even employ your talents in study and activities.
The Latin source of employ is the word implicāre, which literally means to enfold or be connected with. This ties in with the verb employ, which is transitive and needs a direct object. (You can't just say "I will employ — you have to employ something.) The word also suggests using something for a specific purpose: you can employ someone for a job or find something in which to employ your own interests.