venous access devices

I am trying to understand the difference between some of the venous access devices, because there are only a few paragraphs in my textbook for explanation. And I have been trying to find useful information on google, etc - but it isn't getting satisfactory results.

That means - I still don't have a picture of the differences

Specifically - what does an intermittent infusion port look like - how is it used? Is the IV solution flow rate stopped? Does the person go home with only the port?

How does it differ from the PICC?

thanks if anyone can help.