Got this of the internet hope it helps
Here are some examples of players irl who play in these roles:
Essien/De Rossi/Toure = defensive midfielder (they protect the back 4, but somtimes get forward making late runs and support the attack)
De Jong = anchor man (all he does is sit in front of back 4, never getting forward and always playin simple short passes)
Fletcher - ball winning midfielder (he is a centre mid, but 1 who presses the midfielder constantly, doesnt really sit in front of back 4, but gives opponents no time on the ball)
Mascherano is an anchor man in real life, hes always in front of the back 4 and rarely gets forward. A ball winning midfielder doesnt provide much protection for the back 4, he just tries to win the ball back.