Because nothing in life is simple, and even if it is, humankind has a knack for unnecessary complication, the term “trademark” has 2 deeply confusing meanings.  The first narrow meaning is a mark applied to goods.  

The second meaning is a broader one, and is used to refer to marks generally.  For example, “trademark law” covers marks that are applied to goods (“trademarks” under the narrow meaning), marks that are applied to services (“service marks”), as well as certification marks and collective marks.

To help alleviate some of the confusion, Michael Haynes PLC uses the generic term “mark” to refer generally to all types and forms of marks.  But that doesn't resolve the problem completely.  For example, in the US, to register any type of mark, one still must file a registration application in the US Patent and Trademark (the broad meaning) Office (USPTO), which will apply the law of “trademarks” (the broad meaning), whether or not the application is for a "trademark" (narrow meaning, i.e., applied to a good).

So recognize that when the term “trademark” is used, one must analyze the context of that use to know whether the communicator means “mark” generally, or is referring to a mark applied to goods.