A gradient color creative poster is a design featuring a smooth transition between two or more colors, often used to create a visually appealing and attention-grabbing effect. It is commonly used in graphic design for advertisements, social media, and artistic expressions. The technique involves blending colors in a seamless manner to create a sense of depth and movement. Designers use software like Adobe Photoshop or Illustrator to create these posters, experimenting with different color palettes and blending modes to achieve the desired aesthetic.