The folders actually do make sense.

Roaming: this data can be moved between machines in a domain if you have a roaming profile. E.g. go to another workstation and your browser configuration is the same? Means it’s in Roaming.

Local: this data will not be synchronized between machines when you roam. This could be your browser’s cache.

LocalLow: like local, but for applications that are “low integrity”, like Internet Explorer. These folders have special properties. https://helgeklein.com/blog/internet-explorer-in-protected-mode-how-the-low-integrity-environment-gets-created/