A descriptive paragraph, describes how something or someone looks or feels. It gives an impression of something. If, for example, you only wanted to write specific information about a certain river, you could write a paragraph filled with facts about a river. However, if you wanted to tell about the feelings you had when you sailed on a boat on the same river, you would write a descriptive paragraph.
A descriptive paragraph:
gives impressions, not definitions
“shows” the reader
creates a sensory * image in the reader’s mind
*related to the five senses: hearing, taste, touch, sight, and smell
Source: Great Writing 4th Ed. Unit 8 page 156 (Cengage Learning)