Favors and Golden Favors (oftentimes mistaken with gloves, mittens or thumbs ups) are two kinds of game currencies with which you can buy special items with special properties. They cannot be purchased from the bank, they need to be earned.
There is a Favors building on the map. You can find these special items inside.
These items look pretty, but there is more to them! Once you complete a set and put them all in your cafe, they give you a huge bonus! You can see what the bonus is on the items page.
You can earn Favors from leveling up celebrities. You also have the chance to get Favors from completing Catering orders.
You can earn Golden Favors from completing League Tasks. In order to complete League Tasks, you need to join a Cafe Club or create one. You can visit the Everything About Leagues help article for more info.