Prowords and prosigns are vital for fast pace communication. This is not something you learned in 4th grade English class. It is a way radio operators standardize and condense common words, phrases, instructions, requests, and information while transmitting and aid in keeping logs. Prowords are spoken. Prosigns are the written form of prowords and not spoken as they are written. Hang on you'll understand soon enough.
Example when I want to say "Hey y'all, I want to talk to to Billy Jean" It would be broken down using prowords and spoken over the radio like this. BRAVO JULIET ZERO THIS IS BRAVO SIERRA ONE OVER. BJ0 is Billy Jean's call sign. Proword THIS IS means transmission is from the following. BS1 is Big Squirrel's call sign. The prosign for THIS IS is written like this DE. The whole transmission is written in the log book like this. BJ0 DE BS1. With a little practice you can get the basics down in no time. Below is a list of a few common Prowords with their definition. I would do the prosigns but they have overscore and underscore marks on some of the text. If you want more I got about 51 of them.
All after The portion of this message to which I reference is all that which follows
All before The portion of this message to which I reference is all that which precedes
Break I hearby indicate the separation of text from the other portion of the message
Correct You are correct sir (or ma'am)
Correction An error has been made in this transmission will continue with last correct trans
From The originator of the message
Info The addressees immediately following are addressed for information
I Say Again I am repeating transmission or potion indicated
I Verify That which follows I have verified (only used to reply to Verify)
Message A message that requires recording follows (see their is a use for prowords)
More to follow Additional traffic for the receiving station
Out This is an end of transmission and no answer is expected or required
Over This is a end of transmission and a answer is required; go ahead transmit
Read back Repeat entire transmission back to me exactly as received
This is Transmission is from the station whose designator follows
Verify Verify entire message or portion with the origionator and send correct version
Wait I must pause for a second (take a sip of coffee or whatever)
Wait out I must pause longer than a few seconds.
Wrong your last transmission was incorrect
Congratulations you are the 2% that made it to the bottom. In all seriousness this does take practice.