What is the difference between first class and standard mail?

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Tags

1. #given
2. #class
3. #envelopes
4. #delivery
5. #weigh
6. #letters
7. #delivered
8. #local
9. #postcards
10. #packages
11. #small
12. #typically
13. #priority
14. #pieces
15. #large
16. #ounces
17. #standard
18. #first