What are Protocol Buffers? Protocol Buffers are a way of encoding structured data. Protocol buffers are a flexible, efficient, automated mechanism for serializing structured data like XML, but smaller, faster, and simpler. You define how you want your data to be structured once, then you can use special generated source code to easily write and read your structured data to and from a variety of data streams and using a variety of languages. You can even update your data structure without breaking deployed programs that are compiled against the “old” format.
How to use Protocol Buffers with Objective C?