Product is everything the customer receives: the core good or service, its quality, design, packaging, variants, warranty, and the experience wrapped around it. The product decision includes what you refuse to make — every SKU is a claim about who you serve.
Price is the only P that collects revenue; the other three spend it. It covers list price, discounts, credit terms, and — critically in India — the psychological architecture around price points (₹5, ₹10 packs; EMI availability; MRP culture). Price also communicates: it's the fastest signal of intended quality the buyer ever receives.
Place is how the product physically or digitally reaches the buyer: channels, distribution depth, logistics, inventory, and now the choice between marketplaces, quick commerce, D2C websites, and 13 million kiranas. Place decisions are slow and expensive to change, which makes them the most strategic P and the least discussed.
Promotion is the communication layer: advertising, content, PR, sales promotion, personal selling, and digital performance. It's the most visible P — which is exactly why beginners mistake it for the whole of marketing. Promotion can only amplify what the other three Ps have already decided.