The cerebrum is the largest part of the brain. (the part your arrow is pointing to) The cerebellum is the little pink part at the back, and the brain stem is at the bottom.
The human brain is consists of the cerebrum, cerebellum and brainstem. The cerebrum is the largest, cerebellum is located under the cerebrum and brain stem is the relay centre which connects cerebrum and cerebellum to the spinal cord. The arrow in the question is pointing towards cerebrum. It is the largest part of the brain and is divided into four lobes that control senses, thoughts, and movements.
