The word "sent" is the past tense and past participle of the verb "send." To "send" means to cause something, typically a message or an object, to go or be taken to a particular destination or person. For example, you might send a letter through the mail or send a text message to a friend.
The word "send" originates from the Old English word "sendan," which means "to cause to go" or "to let go." Its roots can also be traced back to Proto-Germanic sandwōną and Proto-Indo-European sēnʲ-, which conveys the idea of sending or sending forth.