The official definition is "the theory of intelligent design holds that certain features of the universe and of living things are best explained by an intelligent cause, not an undirected process." [intelligentdesign.org]. Intelligent Design (I.D.) is not a version of Biblical Creationism nor is it a Creationist program. In fact, I.D. researchers come from many religious and even nonreligious backgrounds. They do not promote any religion or scriptures as part of their investigations.
In April, 2008, the documentary film Expelled: No Intelligence Allowed brought I.D. to public attention. The point was about unjust persecution of I.D. proponents. It is a highly controversial movie. Read about the strength and weakness of I.D.