A shared hosting means giving a client a space on the server with several more sites located on it (there may be up to a 1000 of them). All clients are using the server power simultaneously. A good hoster would keep track that neither of the clients would overload the server for all the sites to remain in operation.

Shared hosting is the cheapest type of hosting. An overwhelming majority of the sites in the Internet network are located on such a hosting. If your project does not give a huge load on the server or the connection channel, then a shared hosting is your choice.