Differences between cookies and sessions

cookie and session The difference between ：

1、cookie The data is stored on the client's browser ,session Data on the server .

2、cookie Not very safe , Others can analyze the local COOKIE And carry on COOKIE Deception should be used in consideration of safety session.

3、session It will be saved on the server for a certain period of time . When visits increase , We will compare the performance of your server to reduce the performance of your server , Should be used COOKIE.

4、 Single cookie The saved data cannot exceed 4K, Many browsers limit a site to save at most 20 individual cookie.

5、 So personal advice ： Store the login information and other important information as SESSION Other information if needed to be retained , Can be placed in COOKIE in