What is the difference between undercut and overcut

F1F1 is the pinnacle of open wheel,  single seater car racing and arguably the highest level of any motorsport globally.... There's more... cars are very closely matched, with a mere 1,000’s of a second separating any two cars. Passing on track is difficult, so teams must look at alternative strategies. Often, this means doing the opposite of the car you are competing with. 

The undercutThe undercut is where you gain an advantage on the driver ahead by pitting before him and then maximising your... There's more... is when a driverOK, so we all know what the driver is, right. I've always liked the description that F1 drivers are like... There's more..., struggling to get past another car, pitsThe Pits refers to the area immediately outside a team's garage where they are able to work on the car,... There's more... early to get a performance advantage from fresh tyresToday's F1 cars are running 18-inch wheels (up from 13 inches in recent years) with the widths unchanged - 305mm... There's more.... Hopefully, putting them ahead when their rival pits. By getting the jump on new tyres, they can put in a series of faster laps, closing the gap and hopefully being ahead when the other driver exits the pits. 

The overcutThe overcut is where the driver gains an advantage on the driver ahead by staying out and pitting after him.... There's more... is the opposite of the undercut., where the chasing car lets the car in the front pit first. While pitting, the chasing car will push to close the gap between them in the hopes that they stay ahead even after they pit.