What is the easiest business to start?

I'm curious, what would you say is the easiest business to start in today's market? Is it something that can be done with minimal upfront costs, or does it require a significant investment? Are there any industries that are particularly conducive to new entrepreneurs, or are there challenges that come with starting a business regardless of the field? I'm interested in hearing your thoughts on what makes a business easy to start and what factors one should consider when embarking on this journey.