Gradient color poster design

Quick answer：

Gradient color posters are a popular design trend that uses a smooth transition of color hues to create visually appealing graphics. They are often used in marketing, advertising, and art to evoke a sense of movement, depth, and modernity. Designers create these posters by selecting a color scheme and applying it to various elements, such as backgrounds, text, or images, using software tools like Adobe Photoshop or Illustrator.