Final answer:
The closed lock icon in a web browser indicates that the site is using a secure socket layer (SSL) protocol, ensuring the secure transfer of information.
Step-by-step explanation:
The small closed lock icon near the bottom of your web browser is an indicator that the site you are visiting is using a secure socket layer protocol (SSL). This security protocol encrypts data that is sent between the user's browser and the website, ensuring that sensitive information, such as personal details or credit card numbers, is transmitted securely. SSL adds a layer of security to prevent unauthorized access and protect data integrity.
When you see the lock icon, typically accompanied by in the URL, it means that the website has an SSL certificate and the connection between your browser and the website server is encrypted. You should look for this lock symbol whenever you're entering sensitive data on a website to ensure that the information you provide is secure.