Definition: “Usually used as a marketing term to described a web site that is or is intended to be the first place people see when using the web. Typically, a ______ site has a catalog of web sites, a search engine, or both. A ______ site also may offer e-mail and other service to entice people to use that site as their main "point of entry" (hence "portal" to the web).”

First letter: P

Which word is being defined?