There are five main types of secure sockets layer (SSL) certificates to safeguard your web address. These are: DV SSL, OV SSL, EV SSL, multidomain, and wildcard SSL. The first three types relate to how many layers of verification the website owner went through to get the certificate. The latter two describe how many domains are protected by the certificate. Here’s a table that summarizes the different SSL certificates, and examples of which website types need them: SSL certificate type ExplanationSuitable For Standard (DV) SSL“Domain validation” with standard encryption Covers just one domain: eg www.yourwebsite.com
To get this, you just have to verify you own the domain.   Microbusiness websites: small charity, community, non-profit, campaign website, beauty salon, auto services, at-home services, repair workshops, studios.  Storing no sensitive data and taking no payments.  OV SSL“Organization validation” with good encryption.  You’ll have to submit your business details to confirm you own the website. SMBs, local businesses, tour operators, legal firms, consultants, accountants, care services, agencies, libraries. Holding some data, such as email and log-in but not payment details. EV SSL“Extended validation” with very strong encryption.  Your business details must be verified to rule out fraud. Large websites with sensitive customer data and payment details. This includes online shops, financial services, specialist consultancy, medical services including counselling, and addiction or mental health treatment. Multi-domainCovers several websites (could be three, or several hundred depending on your subscription): eg www.greathaircuts.com www.greatnails.com www.greatskincare.com Entrepreneurs running multiple websites, e.g. web developers, agencies, hoteliers, merchants. Wildcard SSLCovers subdomains: e.g.  yourwebsite.com shop.yourwebsite.com calendar.yourwebsite.com Business websites with subdomains, such as a separate website for an online shop or corporate customers or log in zone/intranet. This includes the education sector, public sector, financial services, and corporate sector.