These two words are terms to describe concepts such as international relations, trade and agreements.

1, Unilateral: Unilateral means that one party takes actions or formulates policies independently without consulting or reaching an understanding with other countries or parties. Unilateral decision-making usually depends on the wishes and needs of one party and affects other stakeholders.

Bilateral: Bilateral refers to the interaction and cooperation between two countries or entities. Bilateral relations usually require both sides to formulate the same policies or actions through negotiation, consultation and understanding. The two sides can cooperate in economic, political, military and cultural fields.