  Bioinformatics, which is now a well known field of study, originated in the
context of biological sequence analysis. Recently graphical representation
takes place for the research on DNA sequence. Research in biological sequence
is mainly based on the function and its structure. Bioinformatics finds wide
range of applications specifically in the domain of molecular biology which
focuses on the analysis of molecules viz. DNA, RNA, Protein etc. In this
review, we mainly deal with the similarity analysis between sequences and
graphical representation of DNA sequence.
