What is subtyping in cpp

Answer 1

Subtyping is a method for substitution and code reuse used in object-oriented programming languages to prevent unnecessary copying of largely similar code and promote code readability and prevent bugs.

From Internet.
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Answer 2

Is it same as inheritance?

Answer 3

Both are similar, but not the same.

Subtyping means writing a class B which conforms to A's interface, as well as possibly adding some new methods of its own. Per Liskov's substitution principle1, in any context where an A is expected we can supply a B instead.

Inheritance means writing a class B that specialises A to a particular use, by reusing some of its behaviour and perhaps overriding parts.

It is further explained here, you can check it out.
https://counterexamples.org/subtyping-vs-inheritance.html