Each computational object has

• a location in memory (obtainable via &)
• a value   (ultimately just a bit-string)
• a name   (unless created by malloc())
• a type, which determines ...
  • its size   (in units of whole bytes, sizeof)
  • how to interpret its value; what operations apply
• a scope   (where it's visible within the program)
• a lifetime   (during which part of program execution it exists)