Here's a breakdown:
* Orchestra: This is the most general term, referring to a large group of musicians playing various instruments, including strings, woodwinds, brass, and percussion.
* String section: This specifically refers to the group of musicians playing string instruments within a larger orchestra.
It's also worth noting that there are more specific terms depending on the type of string instruments:
* Violinists: A group of violin players.
* Violists: A group of viola players.
* Cellists: A group of cello players.
* Double Bassists: A group of double bass players.