The final logo file will be delivered in vector format (adobe illustrator format .Ai, .EPS, PDF) , and also photoshop format (.PSD, PNG, JPG)
Just for your info about Final file deliverables: ----------------------------------------------------------- .AI : Adobe Illustrator vector format - will allow your logo to be scaled up and down as needed, you can also change the color scheme because This file are editable.
.PSD: Fully scalable built with vector masks, Adobe Photoshop layered file. The PSD file format is an industry standard and it allows color changes, or even adding or removing parts of the logo (by hiding or activating layers). The normal desktop printers (ink-jet and colour photocopier) are designed to work happily with a range of image file formats, including JPEG compressed files. However they will still work best with the maximum amount of image data supplied by an uncompressed image such as a PSD file.
.EPS: This is an industry standard, meaning "Encapsulated PostScript". It can be imported into all major design programs, and is often the file of choice for printing companies.