Bandwidth: A measure of how much data can be transferred through your server. Proportional to how much activity (page loads, comment submissions, etc) can happen before the service provider will start throttling your page speeds. Most hosting providers now show bandwidth as a monthly value, often in terabytes (TB). Depending on your website, as little bandwidth as 50 GB can allow around 25,000 visits to your website per month.
Disk Space: How much storage space you have on the server. 3 GB is usually more than enough for most business websites. This one takes only 2 to run! As we add more blog-posts and content this number will slowly start increasing. We optimize all of our images and files for this purpose.
Caché: Unlike the previous two terms, which were dependent on hardware, caché refers to the process of keeping track of the most used items in a server to facilitate and speed-up loading times. Some servers offer amazing caching, while others offer none at all.