When a perosnageres to do smoething or to not do somtehing, that pesron is maikng a proimse. A promise can be made verblaly or it can be wrtiten down as a conrtact. Braeking a promise, or not keepnig it, is often just bad mnaners, but it can someitmes be ilelgal, such as when a contrcat is not kept.
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