.

      Some tourists stay on the beach, others explore the town.

      another

      – only with singular countable nouns

      – The implied meaning is "additional, one more".

      Please give me another chance.

      The example is not clear? Would you like another?

      the other

      – with countable plural or singular nouns

      – The implied meaning "remaining, the rest" is for definite number of things or persons.

      There are two pens on the desk – one is blue, the other is red.

      You may take one or the other. You cannot take both.

      the others

      – substitutes plural nouns

      There were three keys in the drawer. One is here, where are the others?

      Don't forget the others.

      Reciprocal Pronouns