When you lend money, you expect to be paid back with extra payment for your trouble—that extra payment is called interest. Bond investors around the world are currently demanding higher interest payments, which means they expect that central banks (the government institutions that control interest rates) will raise rates in the coming months. This expectation is showing up in rising bond yields, which is the investment world's way of saying "the cost of borrowing is going up."
The key question now is whether central banks will actually do what the bond markets expect. Central banks watch what happens in bond markets carefully—it's one signal they use to understand where the economy is heading. If bond investors are betting on rate increases, that's partly because they think inflation (prices rising) or economic growth might require it. Central banks will have to decide: do they move rates up to match what the markets are already pricing in, or do they hold steady? Their decision will affect everyone who borrows money, from homebuyers to small business owners.