There is provided an encoder for encoding input data to generate corresponding encoded data. The encoder is operable to process the input and to encode at least a portion thereof using at least one Delta encoding algorithm, and to generate one or more predictors for use in encoding one or more subsequent portions of the input data, wherein the encoder is also operable to encode data generated by the at least one Delta encoding algorithm and the one or more predictors by employing at least one entropy encoding algorithm to generate the encoded data. There is provided a decoder for decoding the encoded data to generate corresponding decoded data; optionally, the decoded data and the input data are mutually similar.