The core idea
Yield curve control targets a specific government-bond yield or range, with the central bank prepared to buy or sell securities to defend that objective.
What is happening underneath
Unlike quantity-based QE, the primary commitment is to a price or yield.
How investors should read it
Its credibility depends on whether investors believe the central bank can maintain the target without destabilizing other policy goals.
The same market move can carry different information depending on which maturity, issuer and risk premium is changing. Read the question together with the underlying concepts rather than treating one price move as a universal signal.