Vocabulary knowledge is considered essential in using a foreign language either in spoken or written forms. Therefore, it is common to hear language learners referring to their poor vocabulary knowledge when they fail to produce enough content in writing or speaking. As it is estimated that there are almost 20,000 million words in English, they mention it as a reason for their misuse of words, phrases and collocations. It is too ambitious to aim language learners to learn that many words to communicate effectively in English, yet because language is phrasal in its nature, awareness and knowledge of collocations, i.e. words that occur together, may help learners comprehend written and spoken discourse (Wray, 2002). This article focuses on the nature and formation of collocations and the issues in learning and teaching collocations especially in foreign language settings. In an attempt to raise awareness of collocations, some practical ideas are also suggested.