The present tense is used when writing about something that is happening at that moment. Sometimes a fiction writer may use the present tense to make their writing more immediate, as in this ...

The introduction is usually in present tense due to the fact that you are presenting facts and background information on your research topic. By having this information in present tense, you are ...

Using the present tense can give the writing an almost cinematic, vivid quality, as in this example from Raybearer by Jordan Ifueko: A hot wind rushes into the clearing, swirling up dirt and clay ...