Answer:
Class selector is created by adding a period and a name of your
choice to name a class. An id selector is created the same way
except that it uses the number sign (#) instead of a period. An
id is a unique identifier and should be assigned to a single
instance of an element. Class selectors are used more over id
selectors in almost all cases. Use a single word in naming a
class or id. It should always start with a letter; the use of
special characters is discouraged.
