Dear all
site
i mean i can extract some information from other web site ( i.e. weather)
and then display in my web site.
Not easily - however many web sites now offer something called RSS; these
are free feeds of data in XML format, which you can include in your web site
totally free (and format it to make it look just the way you want). Anything
else is technically copyright theft, unless you explicitly get permission of
the owner of the web site you are leaching from. There is no simple way to
automate the stealing of other sites content and wrapping it up as if it
were your own on your web site, and for pretty obvious reasons.