Question

What is notes?

What is pitch?

Answer 1

A pitch is a particular frequency of sound, for example 440 Hz. Each frequecy stands for a particular pitch.
The sensation of a frequency is commonly referred to as the pitch of a sound. A high pitch sound corresponds to a high frequency sound wave and a low pitch sound corresponds to a low frequency sound wave.

A note is a named pitch. Arbitrarily named, of course, by us humans. For example, Western music generally refers to the 440 Hz pitch as A, specifically A4. So, A4 is a note, which is nothing but pitch of 440Hz.