Why does call glBindBuffer() two times?

void prepare_axes(void) { 
axes[0][0] = -win_width / 2.5f; axes[0][1] = 0.0f; 
axes[1][0] = win_width / 2.5f; axes[1][1] = 0.0f;    
axes[2][0] = 0.0f; axes[2][1] = -win_height / 2.5f;     
axes[3][0] = 0.0f; axes[3][1] = win_height / 2.5f;

// Initialize vertex buffer object.     
glGenBuffers(1, &VBO_axes);
glBindBuffer(GL_ARRAY_BUFFER, VBO_axes);
glBufferData(GL_ARRAY_BUFFER, sizeof(axes), axes, GL_STATIC_DRAW);

// Initialize vertex array object.  
glGenVertexArrays(1, &VAO_axes); 
glBindVertexArray(VAO_axes);

glBindBuffer(GL_ARRAY_BUFFER, VBO_axes); 
glVertexAttribPointer(LOC_VERTEX, 2, GL_FLOAT, GL_FALSE, 0, BUFFER_OFFSET(0));

glEnableVertexAttribArray(0); 
glBindBuffer(GL_ARRAY_BUFFER, 0); 
glBindVertexArray(0); 
}

I was looking into OpenGL source code, but I didn't understand why call glBindBuffer(GL_Array_Buffer, VBO_axes) twice.
From my understanding, after the first time they call glGenBuffer, glBindBuffer and glBufferData, the information of the variable 'axes' is stored in GL_ARRAY_BUFFER.
After that, they generate, bind VAO and call glBindBuffer again.
I can't understand why they did that.
I knew that glBufferData() deletes the current buffer store if there already was one, and creates a new buffer store. This means that the information of the variable 'axes' is fade away when calling glBindBuffer secondly.
Help me please..