A 'mudblood' is a term from J.K. Rowling's 'Harry Potter' series. It's a derogatory slang for witches and wizards who are muggle-born, having a non-magical family background. Characters like Hermione Granger, a talented witch, is muggle-born and often referred to as a mudblood by characters who believe in 'pure-blood' superiority. It reflects significant themes in the series such as discrimination and prejudice.
In the magical world of 'Harry Potter', conceptualized by J.K. Rowling, a 'mudblood' is a quite offensive term used for wizards and witches who are born to muggle parents, meaning non-magical folks.
Characters showing prejudice towards muggle-borns often use the term, somewhat analogous to racial slurs in the real world. Choosing this term isn't random, but deliberate. Mud can be considered pure, quite literally earthy, but when it's mixed with something else (like water), it becomes muddy, mirroring prejudices of many characters against 'mixing' blood.
Hermione Granger, a central character and a muggle-born, faces such derogation quite frequently, especially from Draco Malfoy; however, her character arc wonderfully quashes such biased hierarchies. Furthermore, Rowling's deliberate choice of 'mudblood' underscores her commentary on real-world issues, hinting at her genius storytelling approach.