The word pore has two different meanings:

1. A tiny opening in your skin or in a plant's surface. Your skin has millions of microscopic pores that release sweat to cool you down and oils to keep your skin healthy. Plants have pores in their leaves that open and close to exchange gases with the air, like tiny breathing holes. When you look closely at a strawberry's surface, you can see the pores as tiny dots. Some rocks and sponges also have pores that let water pass through them.
2. To study or read something very carefully and closely. When you pore over a treasure map, you examine every detail, looking for clues about where X marks the spot. A scientist might pore over research data, and a detective might pore over evidence from a crime scene. The phrase always uses “pore over,” not “pour over.” Picture someone bent close to a page, eyes moving slowly across every word: that intense, focused reading is poring over something. Students often pore over their notes before a big test, reading each page carefully to make sure they understand it all.