Sitä = The?

I have read that Finnish doesn’t have articles like ‘a’ or ‘the’. Then, how it the translation of the word ‘sitä’ given as ‘the’ in the phrase ‘Kiitos, sitä samaa’. Is it something related to this particular phrase?

A proud Indian,
Rajdeep.

Yes in written, official language we don’t have it. In spoken language we use the word ‘se’ often like the English word ‘the’. And we conjugate the word ‘se’ too.
For example:
Se sama
Sitä samaa
Siitä samasta
Siihen samaan.
I hope this helps.