pre-noun adjectival
Refers to something or someone close to the speaker, or ideas expressed by the speaker. The most basic demonstrative pre-noun adjective.
この本はとても面白いです。
This book is very interesting.
この考え方は古いかもしれません。
This way of thinking might be old-fashioned.
pre-noun adjectival
last (couple of years, etc.); these; past
Used with time expressions to refer to a recent stretch of time, often implying 'the last few...' or 'these past...'. Common with words like 数日, 数年, ところ.
この数年、海外旅行に行っていない。
I haven't traveled abroad these past few years.
このところ忙しくて休めない。
I've been so busy lately I can't take a break.
pre-noun adjectival
Emphatic, accusatory, or insulting use before a noun referring to a person. Often translates to 'you' in English, but grammatically still a pre-noun adjective. Strongly colloquial and rude.