One of the goals of FIRST and FTC is to recognize the engineering design process and the journey made by the team. The journey includes documenting the engineering design process of the team using an Engineering Portfolio.
Throughout the season the team and robot will confront obstacles, learn lessons, and need to draw things on paper. The engineering portfolio is where teams document their process, from season kick-off through scrimmages and competitions. When it comes time for awards, during the competition the judges will review your engineering portfolio to decide who will receive the awards.
Important information about the engineering portfolio can be found in Game Manual Part 1, specifically section 10.2.
Important Note: The Engineering Portfolio must have the team name & number clearly visible on the front cover. (10.2.4, item #2)
Although the engineering portfolio is not required, all of the awards are given based on what the judges see in the teams' engineering portfolio.