In the past, only companies that asked for confidential information had https websites, and that’s because the extra “s” indicates SSL, or secure sockets layer, which encrypts a user’s connection to a site so hackers can’t intercept their data.
Guess what? Now you need it even if you don’t collect confidential information. Here’s why:
It’s better for users
Your goal is to offer a good user experience, right? Part of a good user experience includes https. (If Yahoo can suffer from a data breach, so can you.)
It’s better for you
Only 3% of online shoppers say they’d enter their credit card or contact information on a site that’s not secure. If you don't have SSL, 97% of would-be clients will take their business elsewhere.
And – because Google says so
Google considers https to be a form of SEO and offers a boost in rankings to secure websites versus unsecure competitors.
Basically: use SSL for security, as an SEO strategy, and to have more credibility with users. (And to stay on Google's good side.)