Final answer:
A collection of web pages allowing user content contribution and modification is termed a wiki, exemplified by Wikipedia, and is part of the collaborative Web 2.0 era.
Step-by-step explanation:
A collection of web pages on various topics that allows people who access it to contribute or modify content is a wiki. This concept is a part of what is known as Web 2.0, which emphasizes user participation and collaboration. A prominent example of a wiki is Wikipedia, an online encyclopedia that exemplifies the idea of crowdsourcing, where thousands of volunteers contribute, edit, and verify the content.
Wikis are beneficial for gathering a large amount of data at a low cost and are a modern approach to creating and sharing knowledge. However, it's important to note that while wikis can be valuable resources, academic rigor is essential, and peer-reviewed sources should be consulted for scholarly research.