Chess Opening Theory/1. d4/1...Nf6/2. c4/2...g6/3. Nc3/3...Bg7/4. e4/4...d6/5. Nf3

= King's Indian Defence =

5. Nf3 Classical
After this, white seems to have a full iron grip on the center with all his pawns defended and no weakness. However, after black castles, he can launch an attack on white's pawn structure with ...c5 and ...e5.

Theory table
'''1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3'''