Confusion between Trademark and Trade Name - Aaga Lag Gayi

Yaar samajh nahi aaya, help karo! Abhi CLAT ke preparation mein hoon aur trademark aur trade name ki difference samajhne mein lagta hoon. Sabse pehle, sabhi samajhte hai ki trademark ek logo, naam ya shabda hai jo duniya mein apna brand distinguish karne ke liye use kiya jata hai. Lekin, trade name kaafi confusing hai. Kya ye trademark ki tarah hi hai ya alag hi cheez? Aur kya trade name ko register karna zaroori hai ya nahin? Maine suna hai ki trade name ka use unke dukaan ke naam ke liye kiya jata hai, lekin phir bhi, mera samajh nahi aa raha.