Memory or Random Access Memory (RAM) allows your computer to multitask. It temporarily stores data and the higher number of GB (Gigabytes) means more applications can be running in tandem without slowdowns. Some intensive applications for gaming or video editing, require more RAM for optimal performance.
Memory described as 'DDR' stands for 'Double Data Rate' and processes data approximately twice as fast as a standard memory module. When a number appears after DDR (ie DDR3) that type of memory is approximately twice as fast as the previous generation.

The laptop screen or desktop monitor is commonly referred to as its display. The display's resolution is a measurement of how sharp, or realistic, your computer's images are. It refers to the number of pixels – tiny points of colour – viewable on the rectangular screen, horizontally and vertically. The higher a display's resolution, the sharper and more realistic its images are.