Interjection:
The part of speech that expresses a strong feeling or sudden emotion or sentiment is called interjection or exclamation. Generally interjections are used in Exclamatory sentences and take often note of exclamation as punctuation.

যে শব্দগুলো আকস্মিক আবেগ, দৃঢ় অনুভূতি বা মনের ভাব প্রকাশ করে, তাদের Interjection বলে। সাধারণত Exclamatory Sentence এ Interjection ব্যবহৃত হয়, এবং এমন বাক্যের শেষে যতি চিহ্ন হিসেবে আশ্চর্যবোধক চিহ্ন (!) ব্যবহৃত হয়।

Interjections are not grammatically related to any other part of the sentence.

Example:
- Oh no! I missed the schedule of the class. (express failure)
- Hey! Don’t you hear me? (calling attention)
- Hey! Take it easy. (calling attention)
- Uh, I forget the answer. (Express hesitation)
- Hurrah! We have won the match. (Express joy)
- Wow! She is amazing. (Express surprise)