Conventions are mostly used by states that have

Conventions are mostly used by states that have unwritten constitution. An unwritten constitution refers to a system of government where the fundamental principles and laws of the land are not codified into a single document, but rather exist in a combination of judicial decisions, parliamentary practices, and traditions. In such states, conventions play a vital role in determining the behavior of political actors and provide a framework for political decision-making. Conventions are informal practices, unwritten rules, and norms that are followed because of tradition or precedent, rather than because they are legally binding. Therefore, they are particularly important in situations where there is no written constitution to guide political behavior.