(CNN) -- Even though the Internet has become a key tool for accessing services, getting an education, finding jobs, getting the news, keeping up with people you know and much more, one in five U.S. adults still does not use the Internet at all, according to a new Pew report.

Why? Mostly they're just not interested -- not in the Web, e-mail, YouTube, Facebook or anything else that happens online.

"Among current non-internet users, almost half (48%) say the main reason they don't go online now is because they don't think the internet is relevant to them -- often saying they don't want to use the internet and don't need to use it to get the information they want or conduct the communication they want," said the report.

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