The Concept of 'Debenture' is Khatam to my Head

Maine 2 din se Company Law padha, lekin ye Section 2(22) ke under ki debenture ki definition ko samajh nahi paa raha hoon. Yeh toh aisa lagta hai jaise Section mein likha gaya hai ki debenture 'convertible debenture' ke roop mein issue ki ja sakati hai, lekin fir se Section 2(24) ke under ki 'debt security' ki definition mein bhi debenture ke characteristics hain. Main ismein kuch confusion mein hoon. Koi bhai ismein kuch light pukarega? Section X ke under ki Section 2(22) and Section 2(24) ke beech ka difference samajhne ki jarurat hai?