Which blog explains RTP in casino games?

Does anyone here know what RTP is in casino games? I read that there is a 'theoretical' RTP and an 'actual' RTP. Could someone please explain the difference in simple terms? I'm actually a little confused. Can you recommend a blog about this?

Which casino do you play at? I started about a month ago and have settled on Fortunecoins for the time being. A friend recommended it to me, saying that it has a good RTP for slots. Incidentally, there's a blog there that explains what is RTP in casino games quite simply. Theoretical RTP is what the developer has built into the game. The actual RTP is what players get over a certain period of time. For example, I understand that Lucky Panda has a stated RTP of around 96.4%, but the actual RTP fluctuates around 95.8%, according to the statistics. However, this is normal; in most casinos, these figures are less accurate.