Our Multi Site plans are a great, cost effective way to keep your websites secure. Many clients choose to host multiple websites on our standard shared hosting accounts due to the low pricing and this is fine if you're only hosting a handful of static websites but in the day and age of the open source CMS this can cause big security problems.
On a standard shared account each site is hosted on the cPanel, under the same linux userID. This means that the bad guys (hackers!) only need to find a weakness in any file, under any of your websites and if they're able to break in then they have full access to every website that you host on the account.
On our D9 Multi Site web hosting plans each of your websites is hosted on its own cPanel account, independent of the others. Meaning if you were unlucky enough for one of your sites to be hacked, it would only impact that one website and not every website you've ever created. Keeping all of your websites segregated is one of the most important parts of website security and is often overlooked in the attempt to save a few dollars. We've seen clients who've ended up with every website they own being hacked due to hosting them all under the same cPanel account and can assure you, that in hindsight, they'd much rather have gone down the multi site route than trying to save a few dollars!