Why did Grendel and Beowulf fight?

Grendel and Beowulf fought because Grendel was terrorizing the mead hall of Heorot, killing and devouring Hrothgar's warriors. Beowulf, a hero of the Geats, sought to help Hrothgar by confronting Grendel to prove his strength and gain glory. Their battle symbolizes the struggle between good and evil, with Beowulf representing heroism and Grendel embodying monstrous malevolence. Ultimately, Beowulf defeats Grendel, showcasing his bravery and prowess.