It's looking in your Keychain Access to try to find saved password information - that Safari or another browser has created (since all apps share Keychain Access for things like saved passwords).
If it regards Password direction, the Safari browser retains a distinctive edge over Google Chrome. Allow me to explain why. When you store login information from the Safari browser, all information gets synced into the iCloud Keychain – Apple’s default password supervisor. The iCloud Keychain works across all of the programs on the iPhone.