Glossary

• Lockout — a short period when an account can't sign in after too many wrong passwords.
• IP address — the internet address a visitor connects from. Often shared by many mobile users.
• IP range — a group of addresses written like 203.0.113.0/24.
• Rate limit — a cap on how many requests one visitor can send in a time window.
• Two-factor sign-in (2FA) — a second code, usually from a phone app, needed after the password.