Both and each

Difference between both and each:

• Both refers to two things considered together, while each refers to the individual members of a group considered separately, or one by one.
• The essence of both is togetherness, whereas the essence of each is separateness.
• Both refers to two only, whereas each can refer to more than two.

Sometimes, it’s important to use each instead of both for clarity:

• I gave both girls £10. This could mean that you gave them £10 to share between them.
• I gave each girl £10. This makes it clear that you gave them £10 each.
• The bank requires a form signed by both account holders. Only one form is needed.
• The bank requires a form for each person’s account. More than one form is needed