What is the difference between align-itmes and align-content properties in css?

Answer 1

align-items property align the flex-items inside the flexible container.
and align-content aligns the flex-lines instead of flex-items.
It's modifies the behavior of the flex-wrap property.
Align-items align the the flex items on cross-axis. It's depend on the flex-direction.
I hope this will help you to understand.
Thanks!