Is it redundant to say “each and every volunteer”?

Question

In the following acknowledgements I am confused that why it should be "each" and every" rather than just "every".

We sincerely appreciate the commitment and hard work of each and every volunteer.

Source: certificate of appreciation by Oriental Connect International Volunteer Association Limited.

I learned from this answer that "each" means "one by one", and "every" "all in a group". But does "each and every volunteer" which indicates literally "all volunteers in a group and one by one volunteer" make sense? And is the saying equal to just "every"? I mean, what is the point that I have missed here?

Answer 1

"Each and every" is a frozen phrase that is used to express an entirety of some group or set. It uses the repetition of ideas for emphasis.

Each and every one of you will receive a gift.

This is somewhat stronger than saying

Each of you will receive a gift.

or

Every one of you will receive a gift.