In F1 is the pinnacle of open wheel, single seater car racing and arguably the highest level of any motorsport globally.... There's more... delta is the difference between two lap times.
A slower lap will show a positive delta and a faster lap a negative delta. A OK, so we all know what the driver is, right. I've always liked the description that F1 drivers are like... There's more... can compare his own delta over the lap or sectors within the lap and you may hear their Race Engineers are a team of experts who manage all aspects of the race and communicate with the driver when... There's more... giving them their delta to another driver.
Measured in tenths, hundredths and thousandths of a second, the delta is displayed by the broadcaster in yellow for positive (slower) and green for negative (faster).