Security: The purpose of an SSL certificate is to encrypt the connection between the user (browser) and the server so that the informations transferred between the browser and the server can not be intercepted.
Identification: A second purpose is to identify the domain or organization that supports a particular domain so that the user accessing the site is sure it has not been diverted to an unwanted site (another web domain), possibly with negative intent. Browsers automatically check if the certificates are signed by a recognized certification authority.
SEO Ranking: Starting in 2014, Google announced that websites using SSL certificates will have a ranking advantage. While Link Building or On-Page Optimization campaigns require implementation time, obtaining an SSL certificate is easy and fast.
What does domain-level validation mean?
In case of domain-level validation, it is checked whether the SSL certificate owner is the domain owner. Such an SSL certificate has a very good encryption level but a lower level of user confidence. Domain-level SSL certificates are recommended for secure blogs or presentation sites.
What does organization validation mean?
Organizational validation is a complex process that checks the organization behind your domain name to provide a higher level of trust for your customers.
An SSL certificate with organization validation is recommended for e-commerce sites and sites that collect private information.
What does the extended validation process mean?
Extended SSL SSL certificates will color the browser's address bar in green, providing a high level of confidence for the user. The complex process of validating the organization contributes to the increase of trust.
These types of SSL certificates almost completely eliminate the possibility of phishing fraud.