Conceptualization can be seen as the inventing or contriving an idea or explanation and formulating it mentally. Building a concept to achive a particular design is not a simple task but they can be achieved by understanding the particular goals and objectives of the project that you have been given.
Once we have gathered this information, we will need to decide on the best way to get this message communicated to the target audience. This is very important because if the Target Market is a group of kids one can not design a product that they can not understand. The message has to be designed in such a way as to ensure that the message is fully understood. Thus the importance of conceptualization. If the original intent of the client is not captured in the Conceptualization stage, the entire design may become faulty.