आज

In a sentence

• आज मौसम बहुत अच्छा है।

  Today, the weather is very nice.

  'आज' is used here to refer to the current day (today); it situates the sentence in the context of the present day.

• आज मैंने एक नई किताब पढ़ी।

  Today, I read a new book.

  In this sentence, 'आज' indicates the time when the action of reading took place, specifying today.

• आजकल लोग बहुत व्यस्त रहते हैं।

  These days, people remain very busy.

  Here, 'आजकल' (rooted from 'आज') conveys the idea of modern times or recent days, extending the usage of the word to reflect a more continuous time frame.