SSL certificates encrypt the communication between your website visitor and the server. They are considered as a must-have nowadays as modern browsers are likely to mark all HTTP sites that do not have them as ‘Not Secure.’
In addition, lack of an SSL certificate could lead to a decreased page ranking on search results.
The Let’s Encrypt certificates adhere to the same security standards and provide the same level of encryption.
Unlike commercial certificates, however, Let’s Encrypt certificates do not provide a warranty of misuse or mis-issuance, or additional features such as site seal.