Hosts typically do not include intermediary network devices like switches and routers, which are instead often categorized as nodes. A node is also a broader term that includes anything connected to a network, while a host requires an IP address. In other words, all hosts are nodes, but network nodes are not hosts unless they require an IP address to function.
Like Flickr, 500px is a popular social network for photographers looking to share their best photos. It doesn't exactly compare to some of the alternatives discussed above because unfortunately, you can't directly link to photos if you want to share them elsewhere, but it's a fantastic option for photographers looking to show off their work and maybe make a little money from it.
Domain names are created to make IP addresses easy to remember. Every computer has an IP address assigned to it - much like a street address. But instead of having to memorize each IP address number, we assign domain names to these numbers so we can easily remember them. The domain name system, or DNS, takes domain names and translates them into their IP addresses so that computers can communicate with one another.