What would you like to understand?

In the example flow network drawn in the video, the leftmost node is the source, labeled $S$, and the rightmost node is the sink, labeled $T$ (or $E$ in the later annotated diagram). The source is where the flow originates, and the sink is where the flow terminates.

Conditions: Refers to the specific hand-drawn example network shown in the video.; The network is arranged roughly from left to right.

In the example flow network drawn in the video, the leftmost node is the source, labeled $S$, and the rightmost node is the sink, labeled $T$ (or $E$ in the later annotated diagram). The source is where the flow originates, and the sink is where the flow terminates.

Conditions: Refers to the specific hand-drawn example network shown in the video.; The network is arranged roughly from left to right.