Recording is essential for several reasons. Firstly, it enables marketers to measure the success of their campaigns against predefined goals. By analyzing recorded data, marketers can identify which elements of their emails are resonating with audiences and which are not. Secondly, recording helps in segmenting audiences based on their behavior, allowing for more personalized and targeted email campaigns. Lastly, it provides a historical record that can be used to compare performance over time and guide future strategy.