How is gravity created and what are its effects on the universe?

Gravity is created by mass, plain and simple - the more mass something has, the stronger its gravitational pull. Its effects on the universe? Well, darling, gravity keeps our feet planted on the ground, planets in orbit around stars, and holds galaxies together like a cosmic glue. Without it, we'd all be floating around like clueless astronauts in a bad sci-fi movie.