Export   

Export["dest.ext",expr]

exports data to a file, converting it to the format corresponding to the file extension ext.

Export[dest,expr,"format"]

exports data in the specified format.

Export[dest,exprs,elements]

exports data by treating exprs as elements.

Export[dest,exprs,elements,options]

uses the specified options.

Details

Export handles a large number of formats, each typically with many different possible elements. The possible formats are given in the list $ExportFormats, and in the "Listing of All Formats".
By default, Export creates a file in the current directory given by Directory[].
In Export[dest,…], dest can be any of the following:
"file" or File["file"] explicit file name

"!prog" export data to a pipe

CloudObject[…] a cloud object

LocalObject[…] a local object
The following combinations of exprs and elements can be given:

expr	elem	export expr as elem
{expr₁,expr₂,…}	{{elem₁,elem₂,…}}	export expr_i as elem_i
{expr₁,expr₂,…}	{elem₁,subelem₁,…}	export expr_i as sublement subelem_i of elem₁
rules	"Rules"	export elements and expressions rules

	{"format",elem}	a single element
	{"format",{elem₁,elem₂,…}}	multiple elements
	{"format",elem₁,sublelem₁,…}	subelements of subelements of elem₁
	{"format",rules}	export elements and expressions rules

	elem->val	a value for a single element
	{elem₁->val₁,elem₂->val₂,…}	values for several elements
	elem₁->val₁,elem₂->val₂,…	an association for several elements
	elem₁->{elem₁₁->val₁₁,…}	values for subelements

Export takes an OverwriteTarget option for all formats. Possible settings include:

	False	do not overwrite an existing file
	True	overwrite an existing file (default)
	"KeepBoth"	keep the existing file, automatically choosing a name for the new file

Use Export[dest,…,options] to provide format-specific options that control the behavior of the export.
Export[file,NotebookObject[…],…] when possible exports the content of the notebook referenced by the NotebookObject.
New formats can be manually registered in the Wolfram Language. See the tutorial for "Developing an Export Converter".