Step-by-step explanation:
You can work with vector objects as well as raster images in Photoshop. Understanding the differences between them will help you decide which to use when.
A vector object has smooth curves connected by points and is created mathematically. The edges of a vector object remain crisp no matter how much you scale the object up or down. This makes a vector object indispensable for logos, icons, and other design products that you plan to use at different sizes.
A raster image is made up of pixels—tiny squares of image information arranged in a grid. Raster images are ideal for representing the many tones and colors in a photograph. But when you make a raster image bigger, the small squares at its edges become visible. So raster images are not the best choice for graphics you plan to scale.