Solid

In the context of general knowledge, "Solid" refers to one of the three primary states of matter, alongside liquids and gases. Solids have a definite shape and volume due to tightly packed particles that vibrate in fixed positions. This structure gives solids strength and stability, allowing them to maintain their form unless a significant force is applied. Common examples include wood, metal, and ice. Solids are essential in numerous applications, from construction to everyday objects, and their unique properties play a crucial role in both nature and technology.