Is this grass or something different?
Both of these are grasses. They look like bluegrasses (Poa species). There are several species of bluegrasses in Maryland: Kentucky bluegrass, annual bluegrass, and roughstalk bluegrass are some of the common types. https://www.marylandbiodiversity.com/viewSpecies.php?species=4106
The seeds have value for wildlife. You could let them grow if you like the look and are not in a neighborhood that has restrictions on meadows/tall grasses. Check with your town's environmental department and/or your homeowner's association (if you have one).
If you are interested in using plants that support wildlife, it is a good idea to use native plants that are adapted to Maryland conditions. Refer to the following article about making meadows using native plants. https://marylandgrows.umd.edu/2019/03/08/how-to-make-a-meadow-in-maryland-steps-for-year-1/