When you compile your project, LaTeX generates numerous auxiliary files which are stored user-by-user in a 'cache' as opposed to with the project. Those generated files typically include .aux, .log and .toc files, which are used for cross referencing, generating bibliographies, and making tables of contents. LaTeX's generated (auxiliary) files are not listed, i.e., visible, within your project but remain "behind the scenes" within the cache, to be regenerated as required the next time you recompile the document.