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ii This paper is intended to introduce in the TCP-friendly Rate Control Protocol (TFRC) and to show some current developments that make use of the protocol. Additionally, it should be looked at further developments of the protocol. TFRC is a congestion control mechanism designed for unicast flows operating in an Internet environment and competing with TCP traffic. It is designed to be reasonably fair when sharing bandwidth with TCP flows, where a flow is "reasonably fair " if its sending rate is generally within a factor of two of the sending rate of a TCP flow under the same conditions. However, TFRC has a much lower variation of throughput over time compared with TCP, which makes it more suitable for applications such as telephony or streaming media where a relatively smooth sending rate is of importance. This paper starts with an introduction, which explains the purpose of TCP-friendly rate control mechanisms in the Internet. Afterwards, the functioning of the TFRC protocol is depicted and its behaviour is compared with TCP. Then, some examples of use for TFRC ar