A special file that enables SSL communication between a website and the user\'s web browser.
SSL stands for \"Secure Sockets Layer,\" which is a protocol for encrypting confidential information, such as passwords and credit card information, transmitted over the Internet. You can tell when you are visiting a site that is using SSL because the address should start with \"https://\" and your browser should display a lock icon in the toolbar.
In order to provide a service, like online banking, over SSL, a secure server certificate is required. For real use, the certificate also needs to be digitally signed by a trusted certificate authority. Web browsers have a list of the authorities, such as Thawte and Verisign, from which they will accept a signed certificate. If the certificate is not properly signed, the SSL connection can still work, but the web browser may give a warning about the certificate. An SSL certificate is usually purchased on a yearly basis.
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