An SSL certificate (Secure Socket Layer) is a protocol that is used for verification of server identity.  It is a bit of code on server which secures website and allow its encryption to switch from HTTP to HTTPS. It protects all the information which a visitor submits on a website or receive from a website which leads in building a trust on that brand.

SSL Certificates include a domain name, person's or organization name it was issued to, certficate authority's name and digital signature, associated subdomains, issue and expiry date, and public key.

By acquiring the SSL Certificate, you show your visitors that your brand is authentic and trustworthy.