SSL is the abbreviation of Secure Socket Layer. The SSL certificate has two main functions, namely authentication and data encryption. The SSL certificate can authenticate the identity of an individual, enterprise or website. When your user visits the website, he can click on the security seal on the page to understand the specific information of your website. The EV certificate verification system is the most stringent among all certificate types, so the EV certificate is also the most trustworthy certificate. Another important function of the SSL certificate is encryption, which means that it can protect the personal information entered by users on your website and ensure that this information is not intercepted by outsiders.

CA is the issuing organization of certificates. As a neutral organization, CA provides encryption for information transmission and does business owner identity verification. Not all companies can be called CA. The current authoritative CA companies mainly include Digicert, Entrust, Comodo, Geotrust, Symantec, etc.

SSL certificate is a standard for network security, which can protect your users' information while verifying your identity. A SSL certificate is essential for a shopping website. The SSL certificate encrypts the data transmitted between the computer and the web server to protect sensitive customer information, such as name, address, password or credit card number . Websites with SSL certificates must be authenticated, so the possibility of phishing websites can be completely eliminated. For users, whether the website has a SSL certificate is a filter to identify whether it is safe or not.

In addition, the browser will prompt the security of the website with the SSL certificate, and the user can see that the address bar starts with "https://" and is marked with a security lock icon.

The types of SSL certificates on the market can be roughly divided into three categories:

Individual Verification (IV): refers to the SSL certificate that verifies the real identity of the website operator, can encrypt the confidential information of the website, and can prove the real identity of the website. Does not pass the CA verification, so the level of this type of certificate is lower.

Domain Verification (DV): refers to a SSL certificate that only verifies the ownership of the domain name of the website, and only encrypts the confidential information of the website, which is relatively simple and cannot prove the true identity of the website to users. This is an entry-level certificate and is issued faster.

Fully Verified (OV, EV): refers to the SSL certificate that verifies the real identity of the website to which the website belongs, encrypts the confidential information of the website, and can prove the real identity of the website. It is the best guarantee for network security and the highest level of all certificates.

You need to use a SSL certificate wherever you want to send information securely. For example: SSL certificate can ensure that your users safely visit your website; ensure the communication security of your company's internal website; ensure the safe sending of emails; ensure the security of information inside and outside the server; ensure that information is obtained and sent through mobile devices security etc.