an individualized description of a particular instance
"The detective provided a detailing of the crime scene that left no doubt about who was present when the incident occurred."
gerund of detail
"The car detailing took all afternoon because there was so much dried mud on the wheels."
present participle of detail
"The mechanic spent hours detailing the car to make it shine like new."
In plain English: To detail something means to describe it carefully by listing all its specific parts and features.
"The car mechanic spent two hours detailing the vehicle to make it shine like new."