What is the Snydercut?

I just wanted to ask what is the Snydercut. I hear a lot of people talking of it but i don't understand what it is/mean.

Can someone explain me?

the version of Justice League, made by Zack Snyder

JL revisioned by Snyder

• removed red filter and tons of CGI remodels
• plenty of reshoots, expected to see Darkseid and other members of JL
• 4-6 hours long
• will be aired on HBO