Reading is the process of extracting meaning from written symbols. There are various reasons for reading, such as language learning or obtaining information from magazines, letters, etc. The aims of reading include being able to read unfamiliar texts silently with understanding. Problems in reading comprehension can arise from concepts, vocabulary, discourse markers, or issues linking ideas beyond the literal text. Faulty habits include subvocalizing or finger pointing. There are three levels of comprehension - literal, inferential, and evaluative. The three main approaches to teaching reading are bottom-up, top-down, and interactionist. Skimming and scanning are speed reading techniques - skimming obtains the overall idea while scanning searches for specific information quickly.