Depth of vocabulary knowledge and reading comprehension

Today, learning English is important in all over the world. Many people study English as a second language (ESL) or English as a foreign language (EFL) in different nations. Recently, the fields of teaching English as a second language (TESL) and teaching English as a foreign language (TEFL) have developed rapidly. The purpose of this study was to investigate if there is a relationship between reading comprehension and depth of vocabulary knowledge.