Answer:
A polynomial can have:
constants (like 3, −20, or ½)
variables (like x and y)
exponents (like the 2 in y2), but only 0, 1, 2, 3, etc. are allowed
that can be combined using addition, subtraction, multiplication and division except not division by a variable (so something like 2/x is right out)
So, a polynomial can have constants, variables and exponents,
but never division by a variable.
Also they can have one or more terms, but not an infinite number of terms.
Explanation: