"Immer" is used in the context of "always." For example: "Für immer jung." (Forever/always young) While "ewig" means forever, and should be used like this: "ein ewiges Einerlei" (An eternal monotony). This can be confusing however, as you use the two together sometimes (Für immer und ewig; Forever and always.) It's all about context, and the two words are basically the same. I hope this helps you a bit!

could you make it more close ? really i can't get the meaning , put it in a sentence or in a situation .