Computer Displays > Physical Screen + Graphic Card + Browsers + Cache Memory

Physical Screen

Screen Size is measured in inches from corner to corner. Examples: 17 inches (small), 21 inches (big)
Screen Aspect Ratio is measured by proportion Width:Height. Examples: 4:3 (normal), 16:9 (panoramic)
Screen Technology
- CRT Old screen | Better colors clarity and depth | Easily to change resolutions | More energy and heat | More eye fatigue | Usually have an aspect ratio of 4:3 | Refresh rates | Dot Pitch
- LCD New screen | Worse colors | Has one native optimal resolution | Less energy and heat | Less eye fatigue | trending aspect ratio towards 16:9 | Viewing Angles | Contrast Ratio | Color Gamut | Response Times

Screen Resolution is measured in pixels WidthxHeight. Examples: 1024x768 (low), 1280x1024 (high)
Screen Color depth is measured by a number of bits. Examples: 16 (medium), 32 (highest)

Each Platform (PC or Mac) has got its own Operating System (For PC: Windows, Linux | For Mac: OS), and each Operating System has got its own Browsers availables
Browser Names: Mozilla FIREFOX, Internet EXPLORER, Apple SAFARY, Google CHROME, OPERA (Mac)
Browser Window Size If Maximized: Width is equal to Screen Resolution | Height is a bit less than Screen Resolution (due to Operating System bottom bar)
Browser Content Area (fold) Width is a bit less than Browser Window Size (due to right scroll bar) | Height is less than Browser Window Size (due top browser chrome that can vary from different users)

Cache Memory is a physical space in your computer where the browser stores the last version of a page, so when you request that page again, if that page takes long time to download, the browser takes that version in the cache memory instead of the real page.
Clear the Cache Memory: to load the new real live version of that page you have to clear the cache memory by:
- Reload or Refresh that page again in the browser (or press F5 key)
- In Internet Explorer: Tools > Delete Browsing History > Temporary Internet files > Delete (button). Then press F5 key
- In Mozilla Firefox: Tools > Clear Recent History > Select Cache > Clear Now (button). Then press F5 key
- Add a question mark "?" at the end of your page with some characters, ie: www.domain.com/page.html?12345