'That is a beautiful painting' - What type of pronoun is 'That' in the sentence?

'That' is a Demonstrative pronoun.

• Demonstrative pronoun
- ব্যক্তি বা বস্তুকে যদি এটি, ওটি, এগুলি, ওইগুলি ইত্যাদি শব্দ দ্বারা নির্দেশ করা হয় তাহলে এই শব্দগুলোকে বলে demonstrative pronoun.
Example:
- This is a good pencil.
- That is a beautiful painting.
- These are bad pens but those are good.
এই this, that, these, those - word গুলি যথাক্রমে pencil, painting, pens-এর পরিবর্তে বসে সেগুলোকে নির্দেশ করছে।
এ গুলো হল Demonstrative pronoun.

• Pronoun ৮ প্রকার।
যথা-
1. Personal Pronoun (He, I, we, me, you),
2. Demonstrative Pronoun (this, that, these, those),
3. Interrogative Pronoun (what, who, which),
4. Relative Pronoun (what, who, which, that),
5. Indefinite Pronoun (one, some, any, many),
6. Distributive Pronoun (each, every, either, neither),
7. Reflexive Pronoun (myself, yourself, themselves),
8. Reciprocal Pronoun (each other, one another).

Source: A Passage to the English Language by S.M. Zakir Hussain.