An SSL certificate is a digital certificate issued by an online certification authority that authenticates your website's identity and encrypts critical information (personal data, credit card information, etc.) sent to the server, using Secure Sockets Layer (SSL) technology.
When you browse https:// sites, you can recognize whether a website has an SSL certificate because your browser will show an icon with a padlock confirming the existence and validity of a certificate.
Visitors will be delighted to book a room at your hotel if they see that your website is safe because it is SSL protected!
Moreover, in 2014 Google announced that their algorithm is taking into account the use of HTTPS to calculate the position of a web, what make it essential to optimize the position of your web.