From
Wikipedia
Types of linebackers
There are typically three designations of linebackers: strongside, middle, and weakside. Sometimes the strongside and weakside are combined under the title outside, and the middle is renamed inside.
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Strongside linebacker
The strongside linebacker is often nicknamed "Sam" for purposes of calling a blitz. Since the strong side of the offensive team is the side on which the tight end lines up, the strongside linebacker usually lines up across from the tight end. Often the strongside linebacker will be called upon to tackle the running back on a play, because the back will be following the tight end's block. He is most often the strongest linebacker: mostly rushing the quarterback or stopping runs, allowing the weakside linebacker to drop into pass coverage.
Famous strongside linebackers include Jack Ham, Shawne Merriman, Bill Romanowski, Willie McGinest, and LaVar Arrington.
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Middle linebacker
The middle linebacker is dubbed "Mike", and is the "quarterback" of the defensive team. Typically the middle linebacker is responsible for calling the play, or communicating with the coach on the play to be chosen. "Mike" must be versatile in his assignment, since he may be called upon to stop a run, or drop back into coverage on a pass play.
Famous middle linebackers include Mike Singletary, Dan Morgan, Ray Lewis, Brian Urlacher, Dick Butkus, Jack Lambert, Sam Mills, Willie Lanier, Zach Thomas, Jonathan Vilma, Tedy Bruschi, Ray Nitschke and Jeremiah Trotter.
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Weakside linebacker
The weakside linebacker, or "Will", must be the fastest of the three, because he is often the one called into pass coverage. Despite this, he will be called in to stop the run if the defense is certain that the offense will run the ball. He is given the freedom to roam the open field because the strongside linebacker ("Sam") is playing the line tight.
Famous weakside linebackers include Lawrence Taylor, Junior Seau, Takeo Spikes, Julian Peterson, Derrick Brooks, Demarcus Ware, Will Witherspoon and Joey Porter
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Roles of linebackers
As referenced above, linebackers must often be the most versatile players on the defensive team. While the linemen's sole job is to shoot the gap and break up the offense, and the defensive backs cover the receivers and stop pass plays, the linebackers must do both. For this reason, quality linebackers are highly sought-after players.
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