Yesterday I wrote a question on TeX.SE:

How can I explain the meaning of LaTeX to my grandma?

I wrote a book about LaTeX, and my proud grandma wanted to have a copy. So she got it, said “What a beautiful picture on the cover!” and - “What is this, LaTeX?”.

She doesn’t know Word, never used a computer. But she reads books. How can I explain what makes TeX and LaTeX special to a non-technical person?

There are already some answers. Perhaps you know eye-opening words? So I could also explain to my boss, why I request some days off to go to a TeX conference, to my daughter what daddy does on the computer, to my girlfriend with what I spend so much time. Possibly you know such situations.