Cais is a term that refers to a type of dock or wharf used for loading and unloading ships. It is typically constructed along the shoreline and provides a stable platform for vessels to moor. Cais structures are essential for maritime trade, allowing goods to be transferred between ships and land transportation. In many coastal cities, such as Lisbon in Portugal, cais areas are bustling with activity. They often feature shops, restaurants, and recreational spaces, making them popular destinations for both locals and tourists. The design and function of cais can vary, but their primary purpose remains the same: facilitating maritime operations.