People or corporate bodies who perform work or provide supplies on a large scale according to a legally binding contractual agreement, at a certain price or rate. For example, in the building and related trades, contractors undertake construction work according to the terms of a contract.Personas que ejecutan trabajos o proveen suministros a gran escala de acuerso a un acuerdo contractual.依據合約協議書內容，概括負責施工或大規模供應材料者。Personen die op grote schaal werk verrichten of voor de bevoorrading zorgen op contractbasis.