Upload and download speeds are generally expressed in units of measurement such as megabits per second (Mbps) or gigabits per second (Gbps). Upload and download speeds can vary depending on the type of network connection used, such as wired connections (such as DSL or cable) or wireless connections (such as Wi-Fi or 4G/5G), as well as the subscription plan from the Internet Service Provider (ISP). In many cases, the download speed is higher than the upload speed because most user activities require a greater amount of incoming data compared to outgoing data. Usually, offers emphasize download speed more, as it is more important for users, but upload speed must be expressed in contracts as well.