INTERNET DEFINITION:
An electronic communications network that connects computer networks and organizational computer facilities around the world
https://www.merriam-webster.com/dictionary/Internet

SEARCH ENGINE:
A machine for converting any of various forms of energy into mechanical force and motion
https://www.merriam-webster.com/dictionary/engine

BROWSER:
The basic functionality of a web browser is to allow the display of text documents, possibly with embedded multimedia resources. In addition, it allows you to visit web pages and do activities on it, that is, link one site with another, print, send and receive mail, among other features.
https://es.wikipedia.org/wiki/Navegador_web