is classified as a ‘pre-noun adjectival’ in Japanese. These are a special type of word that do not conjugate. This means that they will always appear in the same form. この
comes from the same family of words as これ
, and is used to identify a ‘thing’ that is near the speaker.
Is this suit yours?
This work is difficult.
As the name ‘pre-noun adjectival’ suggests, these words will always appear before a noun, and describe that noun in some way.