This is the 54th most frequent Finnish word.
tämä
"This."
In this sentence, 'tämä' is used to refer to a specific object, emphasizing its identity as the speaker's book.
Tämä on minun kirjani.
This is my book.
Here, 'tästä' (the partitive form of 'tämä') indicates the specific color being referred to, adding precision to the object of liking.
Pidän tästä väristä.
I like this color.
In this example, 'tämä' is used demonstratively to specify which picture is being described as beautiful.