Precedent refers to the principle that courts should generally follow the reasoning of earlier decisions when a new case raises similar facts and legal questions, giving the law a degree of consistency rather than allowing outcomes to vary unpredictably between similar cases, a subtlety that rewards careful attention.
Higher courts typically bind lower courts within the same jurisdiction, meaning a ruling from a senior appellate court sets a standard that trial courts are expected to follow until it is overturned by an even higher court or altered by new legislation, which is why the distinction is rarely trivial.
Precedent is not treated as absolutely fixed, since higher courts can revisit and depart from earlier rulings when circumstances or understanding have shifted significantly, but such departures are usually approached carefully given how much predictability depends on precedent holding steady, a consideration that seasoned observers rarely dismiss, however small it might initially seem.