This is the first sequence in Assassin's Creed IV Black Flag
It includes only one memory, "Edward Kenway", which takes place in Cape Bonavista
In this sequence we get introduced to some important characters in the game -Edward Kenway (Protagonist), Duncan Walpole (Assassin), and Stede Bonnet (Merchant)
The sequence also serves as a tutorial where you learn all sorts of game mechanics including ship controls, movement, Viewpoints, combat, Stalking Zones, and more.