As Muggle-born wizards were commonplace in the universe, several Redditors have suggested theories about how Muggles can produce magical offspring.

Source: https://www.cbr.com/odd-harry-potter-reddit-theories/

At one point, wizards lived in peace with Muggles, but rising tensions between the two communities led to the creation of this law.

Source: https://www.cbr.com/harry-potter-stories-good-spin-off/

Muggles are non-magic folk or simply put, ordinary human beings with zero magical abilities in lore.

Source: https://gamerant.com/harry-potter-muggle-protection-act-explained/

“Muggles,” she says, as if she’s dived into the deepest recesses of his mind, “is getting a hit of dopamine from seeking food.

Source: https://www.independent.co.uk/life-style/pets-behavioural-therapist-victoria-stilwell-b2292154.html

Muggle Studies is an optional class in the Hogwarts curriculum where students study the lifestyle of Muggles or non-magical folk.

Source: https://gamerant.com/hogwarts-legacy-sequel-best-classes-to-add/

The Muggles can only see old ruins and warnings of danger if they happen to come across it.

Source: https://gamerant.com/harry-potter-how-many-wizarding-schools/