Third-party logistics (3PL) providers are companies that provide logistics services like transportation, warehousing, and distribution for other companies. 3PLs allow companies to focus on their core business while outsourcing logistics functions. Common types of 3PLs include transportation-based, warehouse/distribution-based, and financial-based providers. Using 3PLs can help companies save time and money, expand markets, and focus on their strengths. However, there are also risks like loss of control and visibility with customers. Choosing the right 3PL requires thorough due diligence and establishing clear expectations, performance measures, and a process for managing the relationship.