It's a sign of respect.

Meaning

This action demonstrates politeness or reverence.

Examples

• John: 'Why do you remove your shoes before entering?'
• Alice: '<b>It's a sign of respect</b> for the house and its owner.'
• John: '<b>It's a sign of respect</b> for your kindness and hospitality.'
• Alice: 'Why do you offer this gift?'