Intervals have a degree, or number, and also a quality, usually Major or Minor.
For example, a Minor 2nd has a quality of Minor and a degree of 2.
The first note is always counted as one.
For example, from C to E would be a third.
Major intervals usually have a happy sound, while minor intervals usually have a sad sound.
We will discuss more later about how to know if an interval is major or minor.