What's the difference between 'a travel agency' and 'a principal'?
I know as little as 'a principal' here is not 'a head teacher'.
Please explain it in easy terms and specifically.
It would be helpful to see the context in which you found those terms connected. com/en/definition/principal: A person for whom another acts as an agent or representative.
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It would be helpful to see the context in which you found those terms connected. However, it seems likely that you are talking about "principal" in sense 3 at https://www.lexico.com/en/definition/principal:
A person for whom another acts as an agent or representative.