Humans have always had the best advantage over other living things thanks to our understanding of biology. Analysis of expressed gene products and their applications are the focus of transcriptomics. Researchers want to know when and where genes are activated or inactive in various cell types and tissues by evaluating transcriptomes. To estimate the level of gene activity or expression in a cell, the number of transcripts can be counted. The fundamental information needed for a thorough study of transcriptomics is covered in this book. This book contains concise, to-the-point information. This book's information should be used as a handbook for a thorough understanding of the topic.