In Excel, every cell has some number of inputs (which are other cells), and a rule for calculating the cell’s value from its input. That is basically how softwa

In Excel, every cell has some number of inputs (which are other cells), and a rule for calculating the cell’s value from its input. That is basically how software build systems work, except usually they use files instead of spreadsheet cells, and they run commands (like “compile this source code”, or “combine these seven files into one program”) instead of Excel formulas.