Mahatma Gandhi was known for his humility because he displayed modesty in his interactions. This means that he did not boast about his achievements or put himself above others. Instead, he treated everyone with respect and kindness, regardless of their social status. Gandhi's humility was evident in his simple lifestyle, his willingness to listen to others, and his belief in the power of non-violence and peaceful resistance. Overall, his modesty and humility were key aspects of his character that endeared him to people and made him a respected leader.