A solution is usually one of two things, depending on context:

  1. Everyday / problem-solving meaning
    A solution is an answer or way of dealing with a problem or difficult situation —for example, finding a way to fix a bug in code, resolve a conflict, or pay off debt. It focuses on solving something that isn’t working.

  2. Science / chemistry meaning
    In chemistry, a solution is a homogeneous mixture where one substance (the solute , like salt) is completely dissolved in another (the solvent , like water). You can’t see the separate parts because they are evenly mixed at the particle level.

If you tell me what context you care about (math, chemistry, real-life problems, tech, etc.), I can expand with short, focused examples.