Trademark classification follows the Nice Agreement — 34 for goods, 11 for services, totalling 45 classes.
Class 9: software, mobile apps — the most crowded class in India.
Class 35: retail & advertising — where every ecommerce brand should file.
Class 41: education & training — essential for edtech and coaching institutes.
Class 42: SaaS platforms & tech consulting.
Multi-class filing is expensive but gives cross-vertical protection.