confusion about unos/as and los/as

Question

I don't understand why in the lessons, they say unas botas and unos pantalones.

Why not las botas and los pantalones?

And also, does unas and unos mean some in Spanish?

Thanks in advance!

Answer 1

Yes. Unos/as means "some". Las/los means "the" in your context.

Answer 2

Unos and unas means "some", los and las mean "the".