Agreement is a kind of act that trust each other's plan or make a conclusion by shaking hands or a piece of agreement paper.
In Oxford, it means harmony or accordance in opinion or feeling. A negotiated and typically legally binding arrangement between parties as to a course of action. The absence of incompatibility between two things; consistency.
Some people might think of subject-verb agreement, a kind of grammar which needs the verb to agreement with the number, group of subjects.
Agreement is an imaginary color but some pictures might match this color. Behind the sunshine, you might see the familiar color and most of the animations uses this color too as the shadow.
Two person shaking hands behind the sunshine in www.businessnewstreasure.com