When you create a Jaxx wallet, a 12-word Backup Phrase associated with your wallet is also generated. Your Backup Phrase are 12 random words that are set in a particular order that acts as a tool to recover or back up your wallet on any platform. You can always see your phrase at Tools > Display Backup Phrase.
Every Jaxx wallet has a unique Phrase. No two users will have the same Backup Phrase, which means no one (including us) will have access to your funds unless you share your Backup Phrase with someone. Please write down your 12-word Backup Phrase and keep a copy in a secure location so you can restore your wallet at anytime.