A host-named site collection allows you to address a site collection with a unique DNS name, such as “ http://collection1.com ” . Typically you will create a SharePoint web application, and it contains many path-based site collections that share the same host name (DNS name). For example, collection1 has a site collection at “ http://mywebapp.com/sites/collection1 ” , and collection2 has a site collection at “ http:// mywebapp.com/sites/collection2 ”. These are referred to as path-based site collections, and is the recommendation for most corporate scenarios. Host named site collections enable you to assign a unique DNS name to site collections. For example, you can address them as http://collection1 .com and http://collection2 .com , which enables hosters to scale to many customers. SharePoint makes the decision on how to map the host name to the site collection when the SPSite object is constructed. It internally uses the SPWebApplication object to find the web applicat