Here's why:
* It's not a proper noun: "Internet" refers to the global network itself, not a specific entity like a company or organization.
* It's become a common noun: Over time, "internet" has become widely used and understood as a generic term, similar to words like "telephone" or "television."
Exceptions:
* At the beginning of a sentence: Like any noun, "Internet" is capitalized at the start of a sentence.
* In formal titles: You might see "Internet" capitalized in the titles of specific publications, websites, or organizations. For example, "The Internet Archive."
In summary: "Internet" is generally lowercase unless it's at the beginning of a sentence or in a formal title.