What does it mean when ebay tells you this?

Shipping and Handling To Service Insurance

US $4.00 United States US Postal Service Priority Mail庐

Estimated delivery 3 - 4 business days after seller receives cleared payment



i dont get the US postal service mail thing? what is thatWhat does it mean when ebay tells you this?
I interpret it as regular snail mail.What does it mean when ebay tells you this?
They are charging you $4.00 for the priority mail.



Otherwise it would take 7-10 days for delivery.



Beats the heck out of Fedex for $12.What does it mean when ebay tells you this?
Perhaps USPS has a service called Priority Mail which is somehow superior to ordinary First Class mail