Portal are large websites coming under Dynamic sites. For portal development, you need Open source application such as PHP . Portals can be made of PHP and PHP Frameworks such as Codeigniter, Laravel, etc.

Classifieds sites are portal sites. Some sites such as Job sites, Matrimonial sites, Product sites, Shopping sites, educational sites, and much more. Portals uses functionalities, usch as Login, Registrations, Contact forms, Listings, Search options, etc..