Benefits

Validation of web content and user input. Without HTTPS, information passed over the web can be intercepted and maliciously altered, so users may receive a different page in their viewport than the page they requested while web servers can receive different information than that submitted by the end user, i.e. information the user submitted into a form.
Privacy of web content and user input. Without HTTPS, all information passed to and from an end user can be intercepted and read in plaintext.
Many industries have moved to an HTTPS By Default approach since 2018. CivicPlus believes it is important for our local government clients to also adopt this best practice.
Improved SEO. For example, websites under the HTTPS protocol have higher places in Google rankings.
Many new browser features require HTTPS to render content.
Users are more likely to browse longer and more frequently on your website because it utilizes a security certificate. This builds a relationship of trust between the user and your website.

Resources