Preposition
These are words that show the relation between the noun and other nouns, or with other parts of the sentence. (ये वे शब्द हैं जो संज्ञा और अन्य संज्ञाओं के बीच या वाक्य के अन्य भागों के साथ संबंध दर्शाते हैं।) On, at, above, under, in front of, due to etc. are among the common prepositions that you may encounter.
Others include: as, than, unless, using, to, from, once, during, towards, through etc.