You spent years or even decades working on your art. Maybe you write novels, make videos or paint pictures. Maybe you're a photographer or a graphic artist. Exactly what you do is not important; the key is that you invested a lot of your time, energy and talent into that work.
Trade secrets are incredibly important. Your whole business may be built on one product or idea. The fact that you alone have the knowledge of how to create that product is what gives your company its strength. It gives you an edge. It sets you apart from other companies that are trying to enter the same space.
Trademark laws exist to help you protect things that are important to your business. Often they identify that business to your potential customers. That's why you trademark a logo, for instance. You want customers to instantly connect it with your brand, and you do not want another company to use it and benefit from your reputation.
There are many different ways to protect intellectual property. Three of the most common are patents, trademarks and copyrights.