This CSS code defines a class ".text-with-shadow" that adds a shadow effect to text elements. The shadow created by this code will be 4 pixels to the right and down from the text, with a blur radius of 8 pixels and a color of #000, which represents black. In simpler terms, any text with the class ".text-with-shadow" will have a black shadow that is 4 pixels to the right, 4 pixels down, with a blur effect of 8 pixels. This can be used to create a visual effect of depth and make the text stand out on the page.