According to Craik's depth of processing theory, what is surface processing?

Surface processing refers to the shallow level of cognitive engagement with information, where the focus is primarily on basic surface features rather than on meaningful content. This type of processing may include attending to the physical characteristics of the material, such as the font, color, or layout, rather than understanding the underlying meanings or concepts. In the context of Craik's depth of processing theory, it is established that deeper levels of processing, which involve semantic understanding and meaningful connections, typically lead to better memory retention compared to surface processing, which is more superficial and less likely to result in long-term memory storage.