Jesus observed people giving their offering at the Temple. It was common for bystanders to observe the faithful making their offerings there. So it was easy to make a show of your offerings. Big heavy coins can sound so impressive when you drop them in the basket. You can help people see just how spiritual you are.
The disciples were also watching the givers, and they were impressed with the big givers. But Jesus was impressed by a tiny gift of a poor widow. There was no loud clang when her tiny mites hit the pot. Jesus called attention to her sacrificial gift. It was worth more than all the noisy, gaudy offerings of the showoffs.
This widow put her money where her faith was. She had to trust God to provide for her. She was living her faith.
I wonder what would happen if we really lived our faith. It might be really scary.
