There are two types of jQuery, they are
There are two versions available
These two versions can be downloaded from jQuery.com
First, It can be included within web page by linking to local copy or to one of the many copies available from public servers.
Next, It is also possible to include jQuery directly from CDNs.
jQuery Client side scripting.
CDN is Content Distribution Network and it is for a group of companies in a different location with the network containing copies of data to maximize bandwidth in accessing data.
The popular jQuery CDN's are