Maid cafés are a subcategory of cosplay restaurants found predominantly in Japan. In these cafés, waitresses, dressed in maid costumes, act as servants, and treat customers as masters (and mistresses) in a private home, rather than as café patrons. 

The first permanent maid café, Cure Maid Café, was established in Akihabara, Tokyo, Japan, in March 2001, but maid cafés are becoming increasingly popular. 

Most maid cafés offer menus similar to those of more typical cafés. Customers can order coffee, other beverages, and a wide variety of entrées and desserts. However, in maid cafés, waitresses will often decorate a customer's order with cute designs at his or her table.

- Wikipedia