Antimatter is matter with its electrical charge reversed. Anti-electrons, called "positrons," are like an electron but with a positive charge. Antiprotons are like protons with a negative charge. Positron, antiprotons and other antiparticles can be routinely created at particle accelerator labs, such as CERN in Europe, and can even be trapped and stored for days or weeks at a time. And just last year, they made antihydrogen for the first time. It didn’t last long, but they did it. Also, Antimatter is NOT antigravity.