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 colours, so your camera may be able to record a wider range of colours than your computer monitor or tablet can display, for example – in other words, the monitor offers a smaller ‘colour space’. To get round this, there are two main RGB colour spaces you can work on. The sRGB colour space is a smaller, universal colour space that practically any device can match. Adobe RGB is a larger colour 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 colour 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.