Linked from
The 11 pages that link to Dividend, each with the reason it gives.
ProfitRelated: It is one way companies allocate profit to owners.
ShareholderRelated: Dividends are one way shareholders may receive value from ownership.
Stock marketRelated: Dividends are one way stock ownership can provide returns beyond price changes.
Rate of returnRelated: Dividends add income to the return earned from share-price changes.