The video tutorial explains unary API calls in gRPC, focusing on their request-response nature. Unary RPCs are the most common API implementation, suitable for small data. The tutorial advises starting with unary calls before considering streaming APIs. It also covers defining unary calls using Protocol Buffers, including creating request and response messages and implementing a Greet service.

What is a Unary API call in gRPC?

• A call that does not require a response

• A call that sends multiple messages from client to server

• A call that involves a single request and a single response

• A call that streams data continuously

Why are unary RPC calls commonly used in API implementations?

• They are simple and handle one request and one response

• They allow for continuous data streaming

• They are complex and suitable for large data

• They require no server-side implementation

When is it recommended to start using streaming APIs over unary calls?

• When dealing with small data

• When no response is required

• When a performance improvement is needed

• When the application is simple

What is the role of Protocol Buffers in defining unary calls?

• They define the structure of request and response messages

• They are used to stream data continuously

• They eliminate the need for a server

• They are not used in unary calls

What does a Greet service in gRPC do?

• It requires no client-side implementation

• It handles database operations

• It implements unary RPC calls with a greet request and response

• It streams multiple messages