But there is a legal difference between the two words. A trademark is a mark that legally represents something, usually a business, by their goods or services. A brand name, however, is the name that a business chooses for one of their products. A brand identifies a specific product or name of a company.Apr 1, 2013

Source: http://www.citadelpatentlaw.com/Vigilance-Blog/2013/April/Whats-the-Difference-between-a-Trademark-and-a-B.aspx

"mark" not Mark and please not pls

What is the difference between mark and brand please?  Can you give me some examples.

Coke and the bottle shape for example.

Mark is usually the actual name of something: Pepsi

Brand is more about the product.  It's symbolic.  For example:  

http://yasminf605.blogspot.com/2015/04/brand-management.html