Final answer:
The most common and simplest type of welding today is MIG Welding, known for its ease of use and widespread application in many industries.
Step-by-step explanation:
The most common and simplest type of welding today is MIG Welding (Metal Inert Gas Welding). MIG welding is a process that uses a continuous solid wire electrode that is fed through a welding gun and into the weld pool, joining two base materials together. A shielding gas is also sent through the welding gun and it protects the weld pool from contamination. Of the options provided, which include MIG Welding, Arc Welding, TIG Welding, and Gas Welding, MIG is recognized for its relative ease of use and efficiency, making it a popular choice for both hobbyists and professionals in a variety of industries.