The concept gained significant attention in the 1990s, particularly in the United States, as a challenge to the theory of evolution. Proponents argue that certain biological structures and systems exhibit complexity and functionality that cannot be fully explained by natural selection.
Intelligent Design relies only upon scientific evidence to support it’s claims. Creationism relies upon religious scripture or doctrinal beliefs.
Intelligent Design offers empirical evidence to support its conclusions (https://www.discovery.org/id/peer-review/), but methodological naturalism—the systematic rejection of any evidence not invoking a random, unguided, “natural” process—results in intimidation and similar efforts to suppress potential evidence from acceptance and publication. (https://en.wikipedia.org/wiki/Sternberg_peer_review_controversy#:~:text=On%204%20August%202004%2C%20an,the%20Biological%20Society%20of%20Washington)
Intelligent Design predicts that the same types of complex, functional, and coded information that are generated by intelligent agents today will be found in nature. Scientists conduct experimental tests upon natural objects to determine if they contain such complex and specified information.
Intelligent Design uses the scientific method, a four-step process involving: 1) observations, 2) hypotheses, 3) experiments, and 4) conclusions. ID begins with the observation that intelligent agents produce complex and specified information (CSI). Design theorists hypothesize that if a natural object was designed, it will contain high levels of CSI. Based on experimental observations, an intelligent design conclusion is reached by inference to the best causal explanation.