Is this a grass or a weed?
I have what could be a grass growing in my side yard. It is a lighter green than the fescue. It has circular stalks and it is not flexible. It is stiff. I wouldn't walk barefoot through it. I am attaching pictures. Some of it grows sideways.
Your first photo looks like poa trivialis (roughstalk bluegrass) a weed grass.
It also shows some poa annua (annual bluegrass) in the lower left-hand corner.
Click here for help with poa annua: http://extension.umd.edu/hgic/annual-bluegrass
Note carefully the conditions that encourage this weed.
Click here for poa trivialis: http://extension.umd.edu/hgic/roughstalk-bluegrass