An SSL certificate ensures the encryption of your users' data. The basic certificates ensure the set up of a channel dedicated to the information flow generated by your users. This encryption enable the confidentiality of their data. There are 3 SSL certificate typologies: the basic, EV and Wildcard SSL. The basic SSL are fast to install and are the least expensive compared to the other types. Since August 2014, Google promotes the URL addresses which contain an SSL certificate (HTTPS). The set up of an SSL certificate is taken into account in the calculation of your quality score for the search engine optimization (SEO). According to Gary Illyes, Trend Analyst at Google, this component would be more and more taken in account in the SEO with the evolution of the algorithm of the search engine.