Design Thinking is an innovation based, human centered approach to build world-class products & services. It has been researched by leading institutions like Stanford School of Design, IDEO, adapted by leading organization like IBM Design Thinking, Google Sprint by Google Ventures to name few and practiced by fortune 500 corporations like PepsiCo and many more.
Some of the top recommended books on Design Thinking

The Are of Innovation – Tom Kelley

The Design of Business – Roger Martin

Change by Design – Tim Brown (IDEO)