Bits are binary digits, and can be either 0 or 1. Storing means placing some information in a memory location. Loading means reading information from a memory location. Input devices allow us to enter data into the computer. System software Stored program concept - John Von Neumann.
Program resides in the computer rather than on tape, punchcards, etc.
System software - tools to facilitate using the system. Operating system - collection of these tools that manage and abstract system resources. GUIs - graphical interfaces to computers. Sometimes entered via switches. Lights showed the values.