Service?

At one time in my life, I thought I had a handle on the meaning of the word "service". The act of doing things for other people. Then I heard the terms:

Internal Revenue Service,

Postal Service,

Civil Service,

Telephone Service,

Service Stations,

Customer Service,

City/County Public Service.

And I became confused about the word "service". This is not what I thought "service" meant.

Then one day, I overheard two farmers talking, and one of them mentioned that he was having a bull service a few of his cows.

SHAZAM! It all came into perspective. Now I understand what all those "service" agencies are doing to us...