This document defines a hypothesis as a preliminary idea or assumption made before conducting research. It provides several definitions of a hypothesis from sources like Merriam-Webster. The document outlines the main types of hypotheses as simple, complex, empirical, null, alternative, and logical. It discusses the sources of hypotheses as personal experience, imagination, observation, scientific theory, and previous studies. Finally, it discusses dimensions like generality and testability that hypotheses should demonstrate, and characteristics like clarity and specificity.