What does Isaiah 63:1 mean?

Who is this coming from Edom, from Bozrah, dressed in bright red clothes? Who is this, so majestic, marching with such strength? 'It’s me, speaking up for what’s right, and I have the power to save.' Isaiah 63:1 - Modern Text Bible

(This dramatic scene introduces someone coming from Edom, covered in red, who declares he stands for justice and has the power to rescue.)