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?