Google Adsense is a website which gives the result of search which is popularly searched and asked by google by different location and language.
Google trends tell people what people are asking and it gives data to related searches that people are asking in a certain language and location.
Google trend allows comparing one search volume with the other.
It has helped to make a decision for if one is searching the term digital marketing then it show what is currently working in the work of digital marketing.
you can also compare search related to digital marketing and marketing .so it gives trends related to any particular keyword.