Here's a breakdown:

* Concentration is a measure of the amount of a substance (the solute) dissolved in a given volume of another substance (the solvent).

Example:

* Imagine you have a glass of water (the solvent) and you add a spoonful of sugar (the solute). The concentration of sugar in the water tells you how much sugar is dissolved in that specific volume of water.

Units of Concentration:

There are many ways to express concentration, some common ones include:

* Molarity (M): Moles of solute per liter of solution

* Percentage (%): Parts of solute per 100 parts of solution

* Parts per million (ppm): Parts of solute per million parts of solution

* Grams per liter (g/L): Grams of solute per liter of solution

Let me know if you'd like more details on a specific type of concentration or have a particular scenario in mind!