Final answer:
The threat mentioned in the question is 'substitutes', part of Porter's five forces that increases competition through globalization and technology, exemplified by videoconferencing replacing business travel.
Step-by-step explanation:
The threat described in the question is the threat of substitutes, which is one of the five forces identified by Michael Porter's competitive analysis framework. The forces of globalization and new communications and information technology have significantly increased competition in many sectors by making it easier for customers to find substitute products and services from different regions and countries. An example of this force in action is how videoconferencing technologies have become a substitute for business travel, potentially reducing the demand for face-to-face meetings and thereby impacting the travel industry.