ProtonMail is a secure email service that prioritizes user privacy. Founded in 2013 by scientists and engineers from CERN and MIT, it uses end-to-end encryption to ensure that only the sender and recipient can read the messages. This means that even ProtonMail itself cannot access the content of users' emails, making it a popular choice for those concerned about data security. The service is based in Switzerland, which has strong privacy laws that protect user data. ProtonMail offers both free and paid plans, allowing users to choose features that best suit their needs. Its user-friendly interface makes it accessible for anyone looking to enhance their email privacy.