The term “pure-blood” is used to describe wizards and witches who have no Muggle blood, Muggle-borns, or half-bloods in their family tree. This means that all of their ancestors were magical and that they have no non-magical blood in their lineage. Pure-bloods are the rarest of the three blood statuses in the wizarding world, with J.K. Rowling estimating that only ten per cent of the wizarding community is made up of pure-bloods.
Pure-bloods have been seen as the “elite” of the wizarding world, with some believing that they are the only “true” wizards and witches. This has led to a lot of discrimination against Muggle-borns and half-bloods, with pure-bloods believing that they are superior to those with Muggle ancestry. This has been a major theme in the Harry Potter series, with Voldemort and his Death Eaters believing that only pure-bloods should be allowed to practice magic.
Despite this, there are many pure-bloods who do not subscribe to this belief. For example, Sirius Black, Harry Potter’s godfather, was a pure-blood but he was a staunch supporter of Muggle-borns and half-bloods. He believed that anyone with magical ability should be allowed to practice magic, regardless of their blood status.
Pure-bloods have also been known to intermarry, with many families marrying within their own blood status. This has led to a lot of inbreeding, which has caused some pure-blood families to become increasingly unstable and prone to mental illness. This is seen in the Malfoy family, who are one of the oldest and most powerful pure-blood families in the wizarding world.
In conclusion, pure-bloods are the rarest of the three blood statuses in the wizarding world, with only ten per cent of the wizarding community being made up of pure-bloods. Despite this, there are many pure-bloods who do not subscribe to the belief that they are superior to Muggle-borns and half-bloods. However, due to inbreeding, some pure-blood families have become increasingly unstable and prone to mental illness.