Computer games are everywhere nowdays, with many styles and features it is quite hard to generalize it all. so i have taken an attempt to do so:
Many of the first computer games were to the point with a single objective to retrieve an object or something of that sort. these games usually never seemed to end and got quite boring as time progressed.
The next generation of computer games offered RPGs (role playing games) like "Kings Quest" or other titles. medieval themed games were popular at the time too. graphics remained the same as the old generation with a few exceptions.
The third genration featured games with life like graphics and many of the genres we know today. this generation produced many, many games that would take me a long time to list them all. this generation was home to "Stronghold", many Star Wars Games.
The present generation has been one of the longest and sacrificed game features for better graphics and control.This generation is still building so theres not much to say...
If I missed anything please tell me so i can correct the mistake.