For the development of chatterbots, the AIML idea is used. Because the AIML uses a theoretical framework that is syntactic and semantic in structure. The main concepts in the Pattern Recognition area are given in order to achieve this. The AIML language is then explained, with each AIML command/tag being followed by an application tag. Pattern Recognition is one of the theories and technologies used to construct chatterbots. Pattern Recognition is based on representative stimulus-response type blocks, into which the user enters a sentence and the software generates a result based on that input. The discourse continues in this sequence. Chatterbots are written in the AIML programming language. The Pattern Recognition approach is used by the chatterbot.