The breakneck development in the Internet showcase and the rising of the new web innovations with another challenges, fresh concepts and modern applicationsfor example, NoSQL databases which is as of late turns out to be well known as an option in contrast to the social databases particularly in managing huge information which is one of the most widely recognized highlights of the web today. This provideshigh accessibility and adaptability to the circulated frameworks when compared to RDBMS. Commonly distributed system needsquick access time and can't endure any vacation during disappointments and has been utilized vigorously by enormous endeavors and web organizations. Every new technology faced many challenges like effective access such as responses with high speed. This paper compares the concepts of NoSQL and Relational databases then it’s limitations. And address the advantages and types of NoSQL databases.