.PSD ~ A PSD is a file format on photoshop, images in photoshop are bitmap. PSD is only for adobe photoshop and keeps all the layers in tact so that when you reopen it everything will be there.
This is an example of the layer pallet in photoshop, when opening up my Borough Market editing photoshop document this comes up in the layers pallet showing the last thing I did to my manipulated item and keeping it in tact for if I then wanted to do more to it.
.JPG-RAW ~ A JPG is a file format for images that can be opened on anything, a windows computer, mac, phones act. It is an image that has been compressed, pushed together to produce a picture, all the layers would have been pushed together without being edited. Whereas RAW is also a compressed file format for images but you can compress it yourself by editing them first without having a jpeg and then editing it in photoshop.
.TIFF ~ A Tiff is an Tagged Image File Format that is used for storing images like JPEG. Gives a higher quality image for when you print.
.PNG ~ A PNG is a Portable Network Graphic that makes the background of a bitmap image transparent.
.GIF ~ A GIF is a Graphics Interchange Format which gives an image transparency so that when going on a page it can overlap a image but not have a white background covering the image up, it is also used for making little animations and used in videos.
.AI ~ A AI is file format in illustrator, images in illustrator are vector if converted. AI keeps the vectors clean and crisp.
.IND ~ A IND is a file format in InDesign which saves all the text and images safely for when you go back on the document but when going back on the format, if having photos on the document you have to change the image quality.
.PDF ~ A PDF is a Portable Document Format which is used to represent documents in an independent manner of application software.
Bitmap ~ A bitmap can not be stretched due to being a pixel image it shows you the pixel grid of which is made up of squares, this means that when making an image bigger to print it the image will pixelate like this :
Vector ~ A vector can be stretched and give a clear and crisp image without the use of pixelation being shown, this means that we can then make the image bigger to print it shown by the image below:
Both these images were zoomed into 1200%