The exact quantity of web services provided today is hard to calculate, but estimates range anywhere from tens of thousands to millions, depending on how you define a web service. Public web services such as search engines, online stores, and social media platforms are thought to amount to the tens of thousands, while platform as a service (PaaS) and software as a service (SaaS) services are believed to total in the millions. As technology progresses and new services become available, the number of web services available to internet users is only anticipated to increase.