Cortana is a virtual assistant developed by Microsoft that offers voice-activated assistance and performs tasks based on user commands. It can perform searches, manage schedules, set reminders, and more.
Search, on the other hand, refers to the general act of looking for information or items within a system or on the internet. While Cortana can facilitate searches as part of its functions, search, in its broader sense, involves seeking information without the personalized assistance and additional features offered by Cortana.