Encoders are devices, circuits, software programs, algorithms, transducers or people that convert information from one format, or code to another. Encoders do this for the purpose of speed, secrecy, security, standardization or to save space by shrinking the size of the desired code. Encoders are used to change data or signals such as bit stream into code. The code can serve a different number of purposes, such as compressing information for transmission and storage, and encrypting or adding redundancies to the input code. Encoders do this by using a programmed algorithm. There are different types of encoders, single bit encoders and priority encoders. Single bit encoders can only handle one input at a time, whilst priority encoders will handle two or more.