The suffix -er is used in professions such as performer or teacher with the meaning of "one who," that is, the one who performs the action, who does something.
What is a suffix?
A suffix is a group of letters that we place at the end of a word. We use suffixes to change the a word's meaning. The suffix -er, which we are analyzing here, means "one who."
Take the verb "to perform", for example. By adding the suffix -er, we transform the verb into the noun "performer," which means one who performs. In "teacher," we transform the verb "to teach" into the noun that means one who teaches.
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