Web hosting is like paying rent for your website's virtual storefront, including the pages, images, documents, and other resources needed to display that site. Web hosting uses a web server, which is where you put those website resources so others can access them through the Web. You can build a fully functional website on your personal computer, but if you want other people to be able to see it, you will need to use a web host.
Strikingly has its focus on one-page layouts. This can be especially interesting if you want to create a landing page, say for event registrations. Their responsive designs are indeed striking (no pun intended) and look great on mobile devices. You can either start with their ad-sponsored free plan or upgrade to the Limited ($8) or Pro plan ($16 per month). Limited also includes a 5-product online store, whereas PRO increases this limit to 300 products.