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Dilute soltion: A solution which contains relatively lower  amount of solute when compared to solvent is known as dilute solution.  In this solution solute is present in a very low quantity(only in trace amount) when compared to solvent. Such type of solutions are called dilute solution. Ex: dilute HCL. Concentrated solution: A solution which contains relatively more amount of solute when compared to solvent is called concentrated solution.  In this solution solute particles are more than what it should . So the solution becomes concentrated. Ex: conc.HCL. Standard solution: The solution whose elements concentration is known, called as standard solution. The element or substance whose weight is known or volume is known which is going to add in a solution is considered as standard solution. Ex: 0.54 gms of salt is added to 20ml water.              Here concentration of both solute(salt) and solvent(water) is known, so it is a standard solution.

Solution A solution is a homogenous mixture of two or more components. The components are completely soluble in the solution. Ex: Salt+water, Sugar+water. A solution mainly contains solute and solvent. Solute: The component which is present in a smaller quantity in the solution is called solute. Solvent: The component which is present in larger quantity in the solution is called solvent. For example in Salt water solution, salt is solute which is less in quantity, and water is a solvent which is more in quantity.