A branch of science without an existing subject.
People engaged in either branch of pseudoscience claim it to be science, either from delusion, ignorance or greed (or all of it). Pseudoscience is invoked in explanations for paranormal phenomenons but not limited to.
Pseudoscience fails to fulfill the definition of science, e.g falsifiability, inconsistance and contradiction of existing knowledge, inabillity to make presumption based on observations or just making a testable hypothesis to an observed phenomenon.
Related to junk scince.
1. Theology - literary, the science of god
2. Intelligent Design - uses "Desinger did it" as a stand-in for argument ad ignorantiam on the science of evolution.
3. Most of the New Age concepts are pseudoscience, such as...
4. Homeopathy - contradicts most of molecular and medical science