Titration: A method used to determine the concentration of an unknown solution by adding a known volume and concentration of another solution until reaction completion.
Indicator: A substance that changes color at different pH levels and is used to signal when a reaction has reached its endpoint.
Neutralization Reaction: A type of chemical reaction where an acid reacts with a base to produce water and salt. This is what happens during titration up until we reach our "finish line" or endpoint.