The International (Nice) Classification of Goods and Services has classified various products and services into 45 trademark classes, ranging from 1 to 34 for goods and 35 to 45 for services. The Indian Trademark Registry also uses this categorisation to classify trademarks. Because each class represents a different product or service category, you must select the appropriate class for your mark. You will only be able to move further with the trademark registration online process if you have picked the relevant category of products and services for your mark.