In some mixtures, constituents are completely mixed in such a way that the entire mixture has the same composition throughout. Such mixtures which have uniform composition are called homogeneous mixtures.
For example, by mixing sugar and water, the entire mixture has the uniform sweetness. Technically such homogeneous mixtures are called solutions. For example common salt, which is solid when dissolved in water, forms a liquid mixture or a salt solution. The salt is totally dispersed into water uniformly and one cannot see it.
A homogeneous mixture is a mixture where the substances are completely mixed together and have uniform composition throughout.
Two-thirds of the Earth’s surface is covered by sea water which is nothing but a homogeneous mixture (solution) of various salts in water. Sea water also contains dissolved gases like oxygen and carbon dioxide. The air we breathe is a homogenous mixture of different gases. Two liquids can also form homogeneous mixture for example water mixes with ethyl alcohol in all proportions. In other words water is miscible with ethyl alcohol or vice versa. Many alloys are also homogeneous mixtures of two or more than two metals. Gold and copper form homogeneous solid solution.
Solid + Liquid: Solid dissolves in liquid to form transparent solution. For example, sugar in water or salt in water, iodine in ethyl alcohol (tincture iodine)
Liquid + Liquid: It forms a single transparent mixture. For example, mixture of water and ethyl alcohol.
Gas + Liquid: Gas completely dissolves in a liquid to form a transparent solution. For example, soda water and any other common soft drink.
Gas + Gas: Mixture of two or more gases. For example, Air.
Solid + Solid: Some metallic alloys like brass, bronze.