Flowchart

This example flowchart uses the tikz-ext bundle. It was written by Qrrbrbirlbel answering a question on TeX.SE.

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\documentclass[tikz,border=10pt]{standalone}
\usetikzlibrary{
  arrows.meta,                        % for arrow tips
  backgrounds,                        % for background layer
  ext.paths.ortho,                    % for ortho paths
  ext.positioning-plus,               % for 
  ext.node-families.shapes.geometric, % loads ext.node-families and
% shapes.geometric,                   % for ellipse
  calc}                               % for ($$)
\tikzset{
  basic box/.style={
    shape=rectangle, rounded corners, align=center, draw=#1, fill=#1!25},
  header node/.style={
    node family/width=header nodes,
    font=\strut\Large\ttfamily,
    text depth=+.3ex, fill=white, draw},
  header/.style={%
    inner ysep=+1.5em,
    append after command={
      \pgfextra{\let\TikZlastnode\tikzlastnode}
      node [header node] (header-\TikZlastnode) at (\TikZlastnode.north) {#1}
      % the next node contains both \tikzlastnode and its header
      % this is needed so that h- can be used to connect lines
      node [span=(\TikZlastnode)(header-\TikZlastnode)]
           at (fit bounding box) (h-\TikZlastnode) {}
    }
  },
  fat blue line/.style={ultra thick, blue}
}
\begin{document}
\begin{tikzpicture}[
  node distance=1cm and 1.2cm,
  thick,
  nodes={align=center},
  >={Latex[scale=.9]},
  ortho/install shortcuts]
\path[node family/width=loop]
  node[shape=ellipse, fill=red]       (imp-sol) {ellipsoid box}
  node[fill=yellow, below=of imp-sol] (rec-box) {
    rectangular box, and very wiiiiiiiiiiiiiiide \\ 2nd line};
 
 
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