There are two options other than shutting down your computer .
1.Sleep
2.Hibernate
Sleep will store all the applications which are running onto RAM. As we are storing on RAM,as it is a volatile memory it will consume power as normal and when we don’t have power(in case of laptop battery)we will loose our data.
Hibernate will store all applications related data onto hard disk and shuts down the computer. In this mode power consumption is almost same as when we shutdown the computer. When we turn on the computer all our data is retrieved during booting. If we are having an SSD it is good to use hibernate over Sleep as power consumption is less.