definition of third party company
A third party is an entity that is involved in some way in an interaction that is primarily between two other entities. A contract might be, for example, between a software company that creates a mobile app and an end user. 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. The third party may or may not be officially a part of the transaction between the two primary entities and may or may not be interacting transparently and/or legally. 1  Here are a few more examples of contexts in which third parties are mentioned: