What does to get a spare or a strike mean?

Answer 1

remember, one turn consists of two throws.

when you get a strike, that means that you knock down all of the pins in one throw, and one throw exactly. if you knock down all the pins on your first throw, you can't have another throw and your turn is over.

when you get a spare, that means you took your two throws and knocked down ALL of the pins.

for example, if you knock down four of the pins in your first throw and 6 pins on your next throw, you get a spare.

but if you get 0 pins on your first throw and 10 pins on your second throw, that is also a spare, not a strike.