Market capitalisation ("market cap") is a company's current share price multiplied by its total number of shares outstanding — the combined value the market currently assigns to every share of the company put together, expressed in rupees (this app shows it in ₹ crore).

Because it's built from share price, market cap moves every time the price moves, even when nothing about the underlying business has changed that day — the same distinction that applies to any price-derived figure like P/E or P/B. It also changes independently of price whenever the share count itself changes: a bonus issue or a stock split increases shares outstanding while decreasing price proportionally, leaving market cap essentially unchanged by the action itself, while a fresh share issuance (such as a rights issue) increases both the share count and, typically, the total capital in the business.

Market cap is commonly used to group companies into broad size categories — large-cap, mid-cap, and small-cap are the most common terms, referring to companies ranked by market cap from largest to smallest within a market. India's securities regulator periodically publishes rankings that classify listed companies into these categories for regulatory purposes such as mutual fund classification; this app doesn't assign or display those specific regulatory categories, but market cap itself — the underlying figure they're based on — is available as a screener metric and shown on every company's detail page.

Market cap measures the market's collective current valuation of a company as a whole — it is not the same as how much cash a company holds, how much revenue it generates, or how much it would cost to acquire every one of its physical assets. Two companies with identical market caps can differ enormously in revenue, profitability, debt, or asset base; market cap alone describes size as the market currently prices it, not the composition of what's being priced.