Transport Layer Security (TLS) What is Transport Layer Security (TLS)? Transport Layer Security (TLS) is a cryptographic protocol that ensures secure communication over the internet by encrypting data and verifying authenticity. Explanation TLS replaces the older SSL protocol and is widely used to secure web browsing, email, and other online communications. It protects data integrity and confidentiality. Practical Example of TLS An e-commerce website uses TLS to encrypt transactions, safeguarding customer payment details and personal information.