After the ABC trademark is registered, it is protected all over the country. What products or services it registers, others can't use this logo on these products or services.

The company is in an area. If no one in this area registers a company with this name, you can apply for registration, which does not conflict with the trademark.

But there is a kind of infringement in the process of use. For example, someone else registered a trademark called ABC on meat products, and you started a company called ABC to make meat products. You can't use ABC in your own products, and you can't directly promote ABC meat products. This is infringement, you can use the full name of the company, and it will not cause infringement. Your company's full name cannot register this trademark.