Standing waves in water occur when two waves of the same frequency and amplitude travel in opposite directions and interfere with each other. This creates a pattern where certain points, called nodes, appear to stay still, while other points, called antinodes, oscillate with maximum amplitude. Standing waves are often seen in enclosed bodies of water, like bathtubs or lakes, and are a result of reflection and resonance. Follow @thatisnewton ,All credits to respective creators/owners. DM for cred