Options in New Document

Brief description of the options in the New Document dialog box is as follows:

Name: Allow you to provide an appropriate name to a new illustrator document. By default,
illustrator assigns the name Untitled-1 to a new document.

Profile: Selects built-in dimensions and color mode for a new document. You can select a build-in profile for the document from the Profile drop-down list. The dimension, resolution and color mode of a document vary from one profile to the other. If none of the profile satisfies the requirement, you can select the Custom option from the Profile drop-down list and specify your own values.

Number of Artboards: Sets the number of artboards while creating a new document. The buttons to the right of the Number of Artboards spin box control the positioning of artboards in relation to each other.

Size: Defines the height and width of a new document. You can either select standard preset dimensions, such as Letter or Legal or specify custom dimensions.

Width: Allows you to specify a custom width value for a new document in one of these six units, namely: Pixels, Inches, Centimeters, Millimeters, Points, and Picas.

Height: Allows you to specify a custom height value for a new document in one of the units selected in the Units drop-down list.

Units: Allows you to select the unit of measurement for a new document. You can select
Pixels, Inches, Centimeters, Millimeters, Points, and Picas in the Units drop-down list.

Orientation: Allows you to select an orientation, such as Portrait or Landscape for a new
document. If you change the document orientation, the width and height values swap.

Bleed: Controls the extra space between the trim line and edge of a document called bleed. There are also various advance options that you can define in the Advanced section of the New Document dialog box. You can click the arrow head before the name Advanced to display those options. 

The options in the advanced section are described as follows:

Color Mode: Allows you to select a color mode for a new document from one of the two
color modes: CMYK (Cyan, Magenta, Yellow, and Black) and RGB (Red, Green, and Blue).

Raster Effects: Allows you to select the document resolution, which provides clarity to raster images. Print documents should have a resolution of at least 150 ppi (pixels per inch); the Web documents can have a resolution of 72 ppi.

Preview Mode: Allows you to select a preview mode for a document. The Default mod splays the document in vector view, the Pixel mode displays the document with a rasterizing
look, the Overprint mode displays the document in an ink preview.

Align New Objects to Pixel Grid: Sets the new object to have its vertical and horizontal paths aligned to the pixel grid. Pixel-aligned objects without any vertical or horizontal segments not modified to align to the pixel grid. For instance, a rotated rectangle is not nudged to produce crisp paths, when the pixel-aligned property is selected because it does not have straight vertical or horizontal segments.