Natural language processing (NLP) has recently gained much attention for representing and analysing human language computationally. It has spread its applications in various fields such as machine translation, email spam detection, information extraction, summarization, medical, and question answering etc. The paper distinguishes four phases by discussing different levels of NLP and components of Natural Language Generation (NLG) followed by presenting the history and evolution of NLP, state of the art presenting the various applications of NLP and current trends and challenges.

翻译：最近,自然语言处理(NLP)在代表和分析人类语言的计算方面受到很大关注,在机器翻译、电子邮件垃圾邮件检测、信息提取、总结、医学和回答问题等各个领域推广应用。 文件区分了四个阶段,讨论了不同层次的NLP和自然语言世代组成部分,随后介绍了NLP的历史和演变、介绍NLP各种应用的艺术现状以及当前趋势和挑战。