Total Yards is a statistical measure of a teams overall offensive production, which focuses on the combined rushing and passing yards generated by the team. It's simply calculated by adding together the total rushing yards and passing yards of a team.
More about Team Total Yards Statistics
In general, the higher the Total Yards the better as it's an indication of a teams ability to move the ball down the field (and not turn it over or punt it away). Often, it will be represented on a per game basis, known as Total Yards Per Game.