Why did they put heraldic symbols on their shields?

Heraldic symbols were placed on shields to identify individuals or families during battles and tournaments, as these symbols served as unique marks of distinction. They allowed warriors to easily recognize allies and foes amidst the chaos of combat. Additionally, heraldry conveyed social status, lineage, and achievements, helping to establish a noble identity and lineage in a visual and memorable way. This practice became a crucial aspect of medieval culture and chivalry.