What is REST Service and When Need to Create?

REST stands for Representational State Transfer. Its is architectural method of software applications basically known as one of the web service. It direcly works on world wide web using HTTP protocol with any kind of data format. There is no such situation like REST architecture should be used. But REST is simple, fast, light-weight than SOAP and no restriction of input/output data forms like SOAP web service.

Restaurant service is nothing but a state of mind 

the only thing that you need find the wright way to do it .