why do i need micro s d caed to transfer my picturs from lg phone to acer laptop

You will need a USB cable, USB drivers and a microSD card to save your pictures to your laptop. Download the drivers from www.lg.com and then connect the phone to your laptop with a USB cable, you should be able to find the "Mass Storage" mode in the menus under settings or tools. This will create another "Removable" drive on your computer and you can copy to and from the SD Card. source