肽是2个或2个以上氨基酸以肽键连接在一起而形成的化合物。氨基酸是什功蛋白质的基本组成单位，所有生物都是疗效由完全相同的20种氨基酸组成的蛋白质构成的。肽链上氨基酸数目在2-10个以内的小分小分小分效和称为寡肽，其中2-4个氨基酸组成的肽的肽的肽称为小肽；由10-50个氨基酸组成的称为多肽；由50个以上氨基酸组成的肽称为蛋白质。
一般根据肽的分子量大小来定义肽：小肽或寡肽分子量小于1000道尔顿；分子量在1000-3000道尔顿称为多肽；分子量在3000-5000道尔顿称为大肽；分子量大于5000道尔顿称为蛋白质。
肽是介于氨基酸与蛋白质之间的生化物
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