Keyword proximity is Keeping your keywords close to each other helps to increase proximity, The smaller the distance between a search term’s individual keywords, the more relevant it will be from a search engine’s point of view.
keyword proximity is refers to the distance between the individual keywords of search term's.
It is used by search engine to measure relevancy of a given page to the search request.
Keyword proximity refers to closeness of keywords. Your keywords should be close to each other in content of web page. Many people don’t know about keywords. They generally treats key phrases as a keyword. Usually we do not target keyword.
Example: This post is related to “Keyword Proximity”. The word “Keyword Proximity” is not a key word. It is a key phrase. Here “Keyword” is a one keyword and “Proximity” is another keyword.
Keyword proximity is the distance between a search term's individual keywords. Proximity looks at the keyword in the sentence and how often it's being used in that sentence and also takes into account the distance between them