Tension vs. Suspense
Tension and suspense are related but not identical. Tension is a present-tense condition: the reader is in a state of dread or unease about what is happening right now, in the current scene. Suspense is a future-tense condition: the reader is uncertain and anxious about what is going to happen. A scene where a character walks through a dangerous building they do not know is dangerous creates tension for the reader through information asymmetry; the reader dreads what is coming, even though nothing has happened yet. A scene where the character knows the danger and must wait for it to arrive creates a different kind of tension: anticipation layered with dread. Both are valuable; understanding the difference helps you build the right kind for the right moment.