What does it mean to say $K$-theory satisfy Mayer–Vietoris sequence?

320 Views Asked by At

I saw the statement "a $K$-theory is expected to satisfy Mayer–Vietoris property and Bott Periodicity" somewhere and I am trying to understand what it means.

What does it mean to say a $K$-theory satisfies Mayer–Vietoris property/Bott Periodicity?