Wikipedia:Wikipedia welcomes editors who strive for anonymity

This is an essay.

It contains the advice or opinions of one or more Wikipedia contributors. This page is not an encyclopedia article, nor is it one of Wikipedia's policies or guidelines, as it has not been thoroughly vetted by the community. Some essays represent widespread norms; others only represent minority viewpoints.

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This page in a nutshell: Yes, Wikipedia can be anonymous. But there are various ways your identity can be revealed.

As an editor on Wikipedia, you will have a choice: You can let everyone know who you are by using your real name. Or you can make your edits with a pseudonym, making your true identity more difficult to ascertain.

Hoping to remain anonymous is your right. But there are ways in which your identity can be revealed, even if you do not wish.

For example, if you are so proud of an article you created that you tell people you know in person, they may read the article, and from looking at your contributions, they can then learn what else you did on Wikipedia. It is very possible that you do not wish for these people (who could be your relatives, friends, or even your boss) to know about other edits you have previously made or that you plan to make in the future. So before you go and brag, you may wish to be aware of this.

You may also get to "know" other editors on Wikipedia (without knowing their true identities) if you work on a project or on many articles within a common area. These are people you may end up in deep discussions with. You may not want them to know about your other areas of interest.

Hiding such edits from your edit history is a legitimate use for having a second account.