You might ask: Why not just share usernames and passwords? Because modern websites use two-factor authentication (2FA) and device verification. Cookies bypass login forms entirely. You don't need the password; you just need the "digital handshake" – the cookie.
A cookie is a small text file that websites save onto your browser. Think of it like a digital ID card. When you log into a service (say, Netflix or ChatGPT Plus), the site gives your browser a cookie that says, "This user has an active, paid subscription." premium account cookies top