Its actually a widely used technique in 3d games (or even 2d) to make it feel like the object is actually glowing without much performance cost. You can use this in any project as you like! Bloom is used in games other than direct lighting because direct lighting is quite computationally expensive for multiple lights. You can observe bloom in real life such as when light enters a dark room, or when light gets reflected from metallic surfaces. Bloom is best used in HDR space. More about that later!
IMPORTANT: Remember this point while you make something glow, when something is glowing the object itself turn more brighter than original but the glow color is from its original color.
