Nowadays many innovative technologies are emerging in the different markets. The relationship between an innovation which is already established in the market and a new budding innovation is not well known in every kind of market, especially when two innovative technologies are competing in different markets. This is the case of the Portable Media Player and the smart phones market. Since very little literature exists regarding the relationship between particular innovations, it is interesting for practice and science to explore it, in order to extend the knowledge in this field. Therefore, this book provides an analysis of how earlier technological innovations are related to new ones in the last phases of its diffusion process. To carry out the study, a review of the relevant literature was conducted. Then, the main elements which may have an influence within the relationship between technologies were selected, consequently analyzed and afterwards applied to our particular case analysis: MP3, iPod and iPhone. These insights should be especially useful for managers or professionals within innovative fields that are responsible for supporting the development of innovative products.