"Another" we use when we mean "one more".
- Your cake is delicious. Can I have "another (one more)" piece of cake?
Article "An" innthis word, indicates that we say only about singolar.
"Other" we use when we say about "one of two things".
- I can't find the "other" glove (one of two gloves).
- These boxes are for clothes. But the "other" ones are for books.
"Others" we use for plural. After this word we don't use more words. The word "Others" is always at the end of sentense.
- There were ten students in the classroom. Now I see only four ones. Where are the "others"?