What is the difference between this and that?

This - is used for a singular thing which is near to speaker. Ex:- Is this your bag? This pen is really very expensive. I can't afford it. That - is used for a singular noun which is far to speaker. Ex:- That is my house. How much is that dress for?

Difference between this and that, these and those Hello English Article 26000: https://helloenglish.com/article/26000/