What is Keyword Proximity & Keyword Density

Q : What is Keyword Proximity & Keyword Density ?
OR
Q : What is the Difference between Keyword Proximity & Keyword Density ?

Ans :

Keyword Proximity : Keyword proximity refers to the closeness between two or more keywords. In general, the closer the keywords are, the better.

For example:

1. How Keyword Density Affects Search Engine Rankings

2. How Keyword Density Affects Rankings In Search Engine

Example 1 is better than 2

Keyword Density : Keyword density refers to the ratio (percentage) of keywords contained within the total number of indexable words within a web page.

The preferred keyword density ratio is of 2-8%.

On net different tools are available for web page's keyword density ratio