Richardson's Pamela is an example of -

Epistolary Novel
অনেকটা চিঠির মতো করে লেখা এই উপন্যাসগুলো।
- A novel told through in the form of letters.
- The narrative of this type of novel is carried forward by letters written by one or more of the characters of that novel.

Example: Pamela by Richardson.

Source: An ABC of English Literature - Dr M Mofizar Rahman