Final answer:
A web browser is the application used to locate and display websites, acting as an interface for users to interact with the internet.
Step-by-step explanation:
The software application that allows users to locate and display websites is a web browser. A web browser is a program that provides an interface for users to access the World Wide Web, enabling them to navigate from one web page to another via hyperlinks, view web pages, and interact with online content.
A firewall is a network security system designed to prevent unauthorized access to or from a private network. A search engine is a software system designed to carry out web searches, which means to search the World Wide Web in a systematic way for particular information specified in a textual web search query. Lastly, URL locator isn't a standard term in the context of internet browsing, but URL stands for Uniform Resource Locator, commonly known as a web address.