Browser encryption is a protection layer that keeps saved browser data encrypted when it is stored on disk. That data can include passwords, cookies, autofill entries, and other profile secrets. On many systems, the browser relies on operating-system features such as user- or device-bound key protection so that the files are harder to read offline or after simple theft of the profile folder.
This matters because it reduces the value of a stolen disk image or copied browser profile. However, it is not the same as full malware resistance. If an attacker runs code in the victim’s user session, the malware may be able to call the browser, access unlocked profile data, or use the same local trust boundaries that the browser uses. Defenders therefore treat browser encryption as one layer in a larger defense: keep systems patched, block suspicious installers, use strong endpoint protection, and protect browser-held secrets with extra controls such as MFA and session monitoring.