There are two most recognized brand equity models: (1) Keller's Model and (2) Aaker Model. Developed by Dartmouth professor Kevin Lane Keller, the first model is also known as the Customer- Based Brand Equity (CBBE) Model, published in his 1997 textbook Strategic Brand Management (our textbook author). The second most famous brand equity model was developed by David Aaker, a professor at UCLA. Aaker defines brand equity as a group of assets and liabilities associated with the brand.

Question: Define both brand equity models and explain the difference and similarity of the two models. (Minimum 100 words) NOT MORE THAN 120 WORDS