The HTML frame is a powerful feature that enables a web page to be broken into different unique sections that are related but can be operated independently without depending on each other.
 The <Frameset> tag :
          The splitting of a browser screen into frames can be done by using <Frameset> and </Frameset> tags.
 Attributes of <Frameset> tag :
          <Frameset> tags require one of the following attributes depending on whether to divide the screen in rows or columns.
    Rows: This attribute is used to divide the screen horizontally i.e, into multiple rows. Multiple values can be set to this property depending on the required size of each row. Possible values for this attribute are
         Number of pixels or can be expressed as a percentage of the screen resolution
    Note: The symbol * indicates the remaining space.

    Cols: This attribute is used to divide the screen vertically i.e, into multiple columns. Multiple values can be set to this property depending on the required size of each column. Possible values for this attribute are
         Number of pixels or can be expressed as a percentage of the screen resolution
    Note: The symbol * indicates the remaining space.

Example:
       <Frameset rows="30%,30%,*">               
          ... Rest of the definition here ...
      </Frameset>

Note: There are several advantages(pros) and disadvantages(cons) of using frames. Now you will be eager to see the advantages and disadvantages of frames.
Advantages of Frames | Disadvantages of Frames

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Frames in HTML pages

Frames in HTML  | Advantages of Frames  | Disadvantages of Frames  | Nested Framesets  | Frame Tag  | Frame Borders  | Resizable Frames  | Frames with Scrollbars  | NoFrames  | Inline Frame