Isaiah 6 is a chapter from the Bible where Isaiah, a prophet or messenger of God, has a special encounter with God. Isaiah saw a vision of God sitting on a throne, high up in the sky, surrounded by angels. The angels were calling out to each other, saying "holy, holy, holy" which means that God is very special and important.
Isaiah felt very scared, because he realized how small and unimportant he was compared to God. But one of the angels touched Isaiah's lips with a hot coal, and his sins were forgiven. This means that even though Isaiah was not perfect, God still loved him and forgave him for his mistakes.
Then God asked Isaiah who would be willing to go and tell everyone about him, and Isaiah said he would. This means that Isaiah was ready to share God's message with everyone, even though he was scared and didn't know what would happen.
So, Isaiah 6 is a story about how we can all have a special relationship with God, even if we don't feel important or perfect. We can ask God to forgive us for our mistakes, and he will still love us and help us share his message with others.