Samsung Galaxy J7 is surprisingly easy to decipher: J for affordable price and 7 for big screen. This is the lite version of the Galaxy A7, offering semi-premium features but confined to the midrange. Another way to look at it is as an E7 Plus.
The attention-grabbing features start at the 5.5 Super AMOLED screen ( Samsung's latest units have all had accurate colors and great sunlight legibility) . There's also a 64-bit octa-core processor, a selfie camera with a dedicated LED flash and a main camera with a wide f/1.9 aperture and Pro mode.
The Galaxy J7 is one of those phones that care more about the size of the screen than its resolution and so it settles for 720p. The difference to Galaxy A7's 1080p screen is for the most part cosmetic but the practical difference is quite big - you get 20% more space for apps and web pages on the A7.
