Velma Dinkley is a character from Scooby Doo. She is the logical one in the group.
Velma Dinkley is usually portrayed as a highly intelligent young woman with various interests ranging from highly specified sciences (which in the "Scooby and Scrappy Doo" series leads her to pursue a career as a NASA research scientist) or merely being very well read on various and sometimes obscure information, such as ancient Viking writing (as in the third Scooby Doo series "The New Scooby Doo Mysteries"). In Scooby-Doo! Abracadabra-Doo, Velma is described by her younger sister Madelyn as being "born with a mystery book in her hand". Consequently, Velma is usually the one to figure out the mystery, sometimes with the help of Fred and Daphne.