Indefinite pronouns refer to people or things without saying exactly who or what they are. "L'autre/Les autres" are part of the indefinite pronouns.
Learn how to use "l'autre / les autres" in French
Look at these sentences:
Je me suis cassé la jambe, mais l'autre fonctionne parfaitement.I broke my leg, but the other one works perfectly.
Trois filles sont restées au bal, les autres sont rentrées chez elles.Three girls stayed at the ball, the others/the other ones went home.
Note that l'autre means the other one, and les autres means the others / the other ones.
Note that autre agree only in number (autres) with the object it refers to.
See also D'autres vs des autres = others (French Indefinite Adjectives)
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