Is the Newton apple story true?

Could you clarify for me if the widely circulated story about Isaac Newton discovering gravity after being struck by an Apple is actually factual? There seems to be some debate surrounding the authenticity of this anecdote, and I'm curious to know if it's based on solid historical evidence or if it's more of a folklore tale that's been passed down over time. Is there any credible source that can confirm or refute this story's validity?