The whole topic of color management can get pretty dry and technical, but stick with it because there’s information here that’s useful and puts lots of other things in context.
Different devices can’t always display the same range of colors, so your camera may be able to record a wider range of colors than your computer monitor or tablet can display, for example – in other words, the monitor offers a smaller ‘color space’. To get round this, there are two main RGB color spaces you can work on. The sRGB color space is a smaller, universal color space that practically any device can match. Adobe RGB is a larger color space that your camera and printing systems can capture but your monitor probably can’t, which means some complex workarounds and pitfalls and really needs a switch to a more complex color managed workflow. sRGB is the simplest solution, and (though some will debate this) you’re unlikely to see any real advantage to Adobe RGB in everyday photography.