Metagenomics is the study of genomic content that recovered directly from environmental samples. There are two basic types of Metagenomics studies.a)Metagenomics based on sequencing and analysis of DNA from environmental samples b)Metagenomics based on screening of particular function or activityThe study of Metagenomic explored many novel microbial genes that are involved in the metabolism like energy acquisition, carbon, and nitrogen metabolism in natural environments. Metagenomics, based on sequencing, is applied to explore the structure of genome, identify the novel genes, and compare the organism genomes of different communities to establish the degree of diversity.