How many services are there and what are their functions?

Traditionally, the PLA has a "Second Artillery Corps".

The basic functions are the same, such as defending the country.

The army is mainly responsible for ground operations, that is, "territorial control."

The air force is responsible for air defense, covering and cooperating with land and sea operations, that is, "air superiority."

Of course, the navy is responsible for "sea control."

The Second Artillery Corps is a strategic and tactical missile force and a nuclear deterrent of China.

There are also new concept services such as "heavenly army" (space) and "cyber army" (cyber warfare), but they have not been formally established or made public. ..................