Who is The process of changing the constitution is started by?

The process of changing the constitution is typically initiated by either the legislative branch or through a national referendum, depending on the specific constitutional provisions of a country. In many countries, amendments can be proposed by a certain majority in the legislature or by a constitutional convention. In the United States, for example, an amendment can be proposed either by a two-thirds vote in both houses of Congress or by a convention called for by two-thirds of state legislatures.