Abracadabra is a spell which focuses on saying a verbal component, namely, Abracadabra, being shouted out.

If used as a cantrip, it can have several fun small interactions:

You create a small illusory effect, such as sparks, or confetti, originating from your hand.
You make a small object, such as a pen, appear rubbery instead of solid material.
You make a coin seemingly dissapear and/or reappear into or out of thin air.

All these effects require a successful Investigation check against your spell save DC to understand it is in fact, an illusion.

If you spend a 1st level spell slot with this cantrip, you can augment the cantrip to manifest bigger magical effects, these are:

You make a single non-magical lock no larger than tiny, lock or unlock. (takes the duration of 30 seconds)
you can pull a tiny beast out of a hat or other small pockets, including bunny, or dove.
You make a small object levitate, for up to a minute. Requires concentration.