Bioinformatics is a multi disciplinary science that use every aspect of other science to understand life mechanisms and life details.
Bioinformatics is in a near relationship with biotechnology and both of them cover some same definition in science.
Bioinformatics is a combination of biology and computer science while biotechnology is a broad scientific discipline where biological sciences combined with engineering.
It is hard to draw borders and separate these definitions because all of them are a part of life that we try to engineer and change for our purpose.