Sure, think of a simple acid‑base titration as a chess game. Put a drop of phenolphthalein in a 10‑ml flask of 0.1 M hydrochloric acid. It stays colourless. Now add 0.1 M sodium hydroxide, drop by drop. The first few drops do nothing, but as you approach the equivalence point, one single drop of base turns the solution pink. That single step flips the entire system—just like a checkmate move. Watching the colour change gives you a clear, decisive pivot that dictates the whole outcome.