I keep hearing the term cold chain in logistics, food distribution, and pharmaceutical supply chains, but I want to understand it in detail. From what I know, a cold chain is a temperature-controlled supply chain that ensures perishable and sensitive products remain safe during storage and transportation.

Can anyone explain how the cold chain works in real-world operations? For example, how do companies maintain the right temperature from production to delivery? What kind of infrastructure, such as cold storage warehouses, refrigerated trucks, and temperature monitoring systems, is used to ensure product quality?