Web services allow different applications to talk to each other and share data and services among themselves: True.
In Computer networking, a web server is a type of computer (server) that is designed and developed to run websites and distribute webpages as they are being requested over the Internet by end users (clients).
By default, the port number "80" are typically opened by an end user or network administrator on a web server.
In conclusion, a web service is designed and developed to avail different software applications an opportunity to communicate with each other and share data and services among themselves, so as to allow developers to create applications using services from third parties.