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Sandboxes, such as a user's sandbox or the more frequently edited Wikipedia:Sandbox, are pages designed for testing and experimenting with wiki syntax and the VisualEditor.
They were created as a place with fewer rules and policies than other pages on Wikipedia. For example, you don't have to follow the Manual of Style or reach community consensus before making a major change. However, they must not be used for malicious purposes, and policies such as no personal attacks, civility, and copyrights (such as non-free content criteria) still apply.
If you have an account, you can create your own sandbox in your userspace. You can find your user sandbox here. If you don't have an account, you can create your sandbox here. (And if it doesn't exist yet, feel free to create it!) For easy access, there is a link labeled "Sandbox" at the top right of every page on either a user icon menu 
or between the "Talk" and "Preferences" links. You can also put {{My sandbox}} on your userpage.