Explain header and footer toolbar in brief?

You can insert certain specific text with the Insert Autotext. The next 3 are the page number, the number of pages in the document and the format of the page numbers. Often you will see something like "Page 5 of 20". The 5 there comes from the page number and the 20 from the number of pages. The next 2 insert the date and time. The next one accesses the Page Setup. The next is the Show/Hide document text which can be used for putting in watermarks. If you have different sections in the document they can have different headers and footers, like for different chapters. You can also have the same ones carry on through different sections. The next icon allows you to link the previous section to the current one. The next icon allows you to switch between the Header and Footer area. The last two allow you to move to the previous and next sections. Finally you have the Close to close the toolbar.