Now I will give you a slightly different take:
Pass Route Tree
The Pass Route Tree (below) illustrates the basic pass routes run by eligible receivers. As a rule odd numbered pass routes are run to the inside portion of the field, even numbered routes to the outside. Basic patterns are to the left in the diagram, specialty routes to the right. Pass routes can be called by number or by name. In a passing play like the 838 Deep Cross, the numbers specify that the outside receiver run a #8 patter, the man next inside him a #3 pattern, the next receiver another #8 pattern. Of course, patterns can be modified. For example the Float is merely a soft, dragging slant pattern. The out and up is a combination of a five yard out pattern and the Fly pattern. The pass routes or patterns depicted here are numbered as follows. #0=The Zero or Curl Pass. #1=5 yard Cross or In. #2=5 yard Out or Sideline. #3=10 yard Cross. #4=10 yard Out. #5=10 yard Hook or Stop (In). #6=10 yard Hook (Outside). #7=Post. #8=Post Corner. #9=Fly or Go. I personally do not favor pass route numbers higher than one digit as this hampers many play calling techniques. Other pass routes can be specified by letters of the alphabet or by name, as in the Flag, Fade, Slant, Float, and the Out and Up. Many coaches use what I call the Banana route where a pattern such as the Post is rounded or bowed in shape.
Other Pass Plays
The Out and Up Pass is a dangerous play designed to take advantage of single (Man to Man) coverage. It requires some "setting up" by having a receiver run the #2 pattern--the five yard out pattern--several times previously. Then the quarterback simply calls the out and up, the receiver runs the out, the quarterback "pumps" the fake pass, then hits the receiver on the fly.
The Curl Pass simply calls for a receiver coming out of the back field in the Curl or Zero Pattern.
The Hitch Pass calls for multiple receivers to one side of the field, then the primary receiver simply steps back a step and catches the quick toss following the blocking of the other receivers around him. One or more linemen can pull around the corner to offer blocking assistance.
The Hitch and Go calls for a pump fake by the quarterback during the hitch, then hitting the receiver on a fly pattern. The Hitch and Go is set up by first running a few hitch plays.
The Hail Mary involves multiple receivers coming together at one deep spot in an effort to outnumber the defenders at the point of reception.