This looks like orchardgrass. It is a perennial grass which makes it difficult to control. Small infestations can be dug out by hand. There is no specific lawn herbicide that will target this weed. Take a look at our website for management options. https://extension.umd.edu/hgic/topics/orchardgrass

Proper fertilizing, mowing, and overseeding will produce a healthier, thicker lawn, less susceptible to weed infestations. Here are more tips for weed prevention.
https://extension.umd.edu/hgic/topics/tips-lawn-weed-prevention-and-management

Christa