Well Tim, your body is made up of something called neurons. Here, let me explain using a post office.
The room we are in is similar to the Cell body of a neuron, which keeps the cell or post office running. It sorts out information that it receives.
How does it recieve information?
A neuron receives information from its dendrites, like how post office get mail from collection bins.
Does it also send out information?
A neuron sends information by first using its axon, like a post office uses trucks to transport mail. The road acts like a myelin sheath, which allows information to be transmitted quickly.
There's more. When the information travels down to the end of the axon, the axon terminal, it releases neurotransmitters which connect to the dendrites of another neuron through the synapse, the space between the two neurons. It's similar to unloading mail from a mail truck into another post office.
Is this process always occuring?
It gets a little complicated. A neuron starts of at resting potential. An absolute threshold must be met for the neuron to fire information. It's like how a post office needs workers in order to run. When the threshold is met, the neuron sends information during a period called the action potential. The neuron fires completely - all or none. But the workers can't work all day right? They go home and rest up for the next day. This is similar to how a neuron takes time to return to resting potential, during a time called the refractory period.