Contrary to what was believed previously, common bacteria that cause infections such as colds and strep throats can persist for long periods on surfaces like furniture and toys. This new knowledge may affect protocols at hospitals and daycares on how to reduce infections. Image via Flickr user Foto Jenny.
The end user is the individual who uses a product after it has been fully developed and marketed.
From the company's perspective, it is the first party and the end user is the second party; from the end user's perspective those positions are switched. The third party in this example might be a marketing firm or an ad network.