Why do different countries have different electric outlet plugs?

There are 15 different kinds of electrical outlets around the world. One standard would be more convenient, but no one wants to change theirs.

Why Do Different Countries Use Different Power Plugs and Sockets? – Zendure

Premium Vector Power socket icon set. world standards for different country plugs. illustration.

Travel adapters suppliers,China plug converters factory, British plugs and soclets suppliers

Why do power outlet interfaces vary in different countries and regions? - Quora

Types of electrical plugs (a) and the countries where they are

How to Use Power Sockets in Europe

Full list: Plug, socket & voltage by country - World Standards

Keep in mind when traveling to different countries!

Why Do Countries Have Different Electrical Outlets?

Why isn't there a universal electric plug? - World Standards.eu

A cool guide to the types of plugs and outlets across the world : r/coolguides