SSL is Secure Sockets Layer, which is the standard of security technology, encrypted communication between the web server and browser. This standard operates and ensures that the data transmitted between the server and the user's browser is private and complete.
Since 2014, Google has officially prioritized websites that support HTTPS over search results.
A website with HTTPS protocol with a valid SSL certificate will minimize the risk of tampering and safety for users due to the data sent from the browser to the encrypted website server.
To get an SSL certificate, you must register with authentication organizations such as Comodo, GeoTrust, Symantec, ... with a certain cost, SSL certificates are divided into 3 types: DV, OV, and EV depending on the type of your website...
Let's Encrypt is an SSL authentication organization like Comodo, GeoTrust, Symantec ... but the other is that they are a non-profit organization established with the sponsorship of large organizations in the world Facebook, Chrome, Mozilla, Cisco, Akamai ... intending to provide free SSL certificates to help all websites be encrypted, creating a safer Internet environment.
All free.
Easy to install via popular control panels like cPanel, DirectAdmin and Plesk.
No authentication required via email ..
Does not require use on a private IP address (charges may apply for additional IP registrations).
Trusted by browsers.