This rating is fairly self explanatory. The games themselves are generally appropriate for players of all ages.
They will contain no (or at the very worst: minimal) violence. Any violence that is depicted will be animated or fantasy violence. You might see Mario bouncing on a koopa’s head, but you won’t see anything much more intense than that.
Most games that I would consider “family friendly” will fall into this category by default. Board games, most mini game collections, and most mascot platform games (eg: Mario and Sonic) all fall here. Even the most conservative parents will have a hard time finding anything objectionable in these games. Many of them are tamer than an episode of Spongebob.
One thing that I need to stress is that ERSB ratings are rating the CONTENT. They do not rate difficulty. The perennial Madden series is a great example here. These games are rated E for Everyone. But, the game has a steep learning curve because it is a professional Football simulator. Most 5-6 year olds would have a difficult time navigating the menus and playing the game.
Some great examples of E for Everyone rated games are: