Website, web application or web service?

Question

Computer networks

Tell me, what will be the service that collects any information on the Internet and notifies the user by mail or SMS about the information found?
At the same time, in order to receive this information, the user needs to interact with the site of this service, that is, register, make settings, etc.
Which term will it be closer to, site, web application or web service?

Answer 1

Site - representative functions (most often).
The company through the site interacts with its customers (existing and potential), partners, etc.
The company publishes information.
A web application is a software tool (sometimes hardware and software) for business automation. It solves some specific problems of a particular company or a particular person.
The company processes the information for itself.
A web service is a system that provides a service(s) to its customers.
The company provides services (perhaps for the provision and processing of information).
I think you have a service.

Answer 2

I think these are two different systems: a website and a spider (scanner)

Answer 3

It will be called https://ifttt.com/ :)

Answer 4

It will be everything.
A website is an interface to web services and add-ons. pages that, strictly speaking, do not belong to web services (for example, the page - "About us").
Web application - the functionality of a website or web service from the developer's point of view, and not from the user's point of view. Perhaps one web application is an entire website. Or a set of individual web applications.