If you have a task to make a report with dozens of tables and dozens of pictures every week or every day, the content is roughly the same, then knitr and LaTeX can be easily generated with one click.
LaTeX is mainly oriented to mathematics, physics, computer and other majors, serving academic publishing. In short, it is to publish papers, textbooks and monographs.
Relationship between Tex and Latex
LaTeX is a format in TeX and a macro language based on TeX. In other words, every LaTeX command will actually be converted into several or even hundreds of TeX commands in the end.
However, ordinary users don't need to know about complicated connections. Just as we can realize many functions with few commands if we use some compiled function libraries and templates when programming, LaTeX defines many commands and templates according to people's habit of typesetting articles, and we can get beautiful typesetting results quickly through these commands and templates.