This is a topic that confuses a lot of people at the start, especially if they are coming from a language that, like English, does not make use of grammatical particles.
I guess I should start by explaining what exactly a grammatical particle is. Particles are grammatical elements that lack meaning of their own but impart meaning when connected with another word. When they are associated with another word, they give some sort of additional meaning to that word. Korean makes extensive use of particles, and today we’ll look at the three most common ones.