Bioinformatics is a tool to be used for the calculation and analysis of biological data.Bioinformatics is necessary for the handling of classified information that it needs in modern biology and medicine.Present, the bioinformatician to provide an understanding of the disease.To the medical, biological intelligence resulted in the discovery of a new drug and allow development to maintain medical. Examples of Bioinformatic applications, such as in new therapeutic advances is the development of novel designer targeted. Drugs such as imatinib mesylate (Gleevec). ฺBioinformatic analysis of the human genome project, more disease genes will be identified and new drug targets will be simultaneously discovered. Bioinformatics will serve to identify susceptibility genes and illuminate the pathogenic pathways involved in illness, and will therefore provide an opportunity for development of targeted therapy. Recently, potential targets in cancers were identified from gene expression profiles.