Unicast is a communication method in networking where data is sent from one sender to one specific receiver. This means that the information is directed to a single destination, ensuring that only that particular device receives the data. Unicast is commonly used in applications like web browsing and video streaming, where a user requests content from a server. In contrast to other methods like broadcast or multicast, which send data to multiple recipients, unicast focuses on one-to-one communication. This can lead to more efficient use of bandwidth for individual connections, but it may require more resources when many users are accessing the same content simultaneously.