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Bioinformatics combines studying of life science, computer science and statistics. Bio-informatics is a specialized branch of Informatics. A Bioinformatician tries  to understand medical and biological systems by applying statistics and computer analysis. Computer application that analyse biological data in a new ways are written,  existing analysis tools are applied to new data sets,  introduction of latest  statistical methodologies into the analysis of data and they may extend existing analysis capabilities to genome scale data sets. The most publicised example of bioinformatics has been the  human genome sequence mapping project.  Other non Bio-Informatics subject areas here :

 

Bio informatics is an applied science employing statistics and computer science technology in molecular biology. Within Biological sciences, Microbiology and Biotechnology, Bioinformatic applications are revealed in genomics and genetics, especially in large-scale DNA sequencing. Bioinformatics is a niche field and despite all the media hype, glitz and glamour of R & D, future applicants must be aware that a Bioinformatics degree leads to comparatively less employment opportunities than straight forward Computer Science, Information Systems, Statistics or Biotechnology. This is evident given the fact some Aussie universities have either scaled down or even completely terminated their Bioinformatics degree programs in recent years.