¡¡¡¡No, it won't affect your rankings, but it wouldn't hurt to leave your site up on the old host for about a month to ensure that the DNS propagates across the Web and that the search spiders are indexing the pages at the new host. Once you see the spiders in your log files at the new host, it should be safe to take down the site at the old server.
¡¡¡¡web hosting service is a type of Internet hosting service that allows individuals and organizations to make their own website accessible via the World Wide Web. Web hosts are companies that provide space on a server they own or lease for use by their clients as well as providing Internet connectivity, typically in a data center. Web hosts can also provide data center space and connectivity to the Internet for servers they do not own to be located in their data center, called colocation.