3) In hardware design, a prototype is a hand-built model that represents a manufactured (easily replicable) product sufficiently for designers to visualize and test the design. The word prototype comes from the Latin words proto, meaning original, and typus, meaning form or model.
In chemistry, a salt is an ionic compound which is made up of two groups of oppositely charged ions. The ion with a positive charge is called a cation, and the one with a negative charge is called an anion.
A salt is essentially an ionic compound consisting of an acidic radical(anion) and a basic radical(the cation). A chemical compound is the union of two or more different elements in which the constituent elements do not retain their properties but the compound acquires its own unique properties. Salt has its own properties too.