Adam and Eve did bite into a fruit. But the Book of Genesis does not explicitly say which fruit. It could have been an apple. Or, as early depictions suggest, it could have been a pomegranate.
Up until the 17th century, the word “apple” meant all fruit other than berries but including nuts.
In Latin, the words for “apple” and “evil” are similar. Mālum is the word for “apple;” mălum is the word for “an evil or a misfortune.”
As a result of the apple’s association with Adam and Eve’s story, it has become a loaded symbol that represents, among other things, temptation, sin, immortality, seduction, the forbidden, and knowledge.