It should point out the articles and studies that have inspired the writer, but it has different other meanings too: A literature review can be a thesis on its own.
It may not be called a Literature Review but gives you an idea of how one is created in miniature.
A well-written literature review should provide your readers a deep insight on the writings that helped you build your research.
You can use specific keywords to search the Internet, every option works fine as long as you focus on your subject.
With such a great amount of interesting articles to read, it can get a little bit overwhelming to make a selection.
The more difficult the topic, the longer the time, obviously.