Understanding Stacks with Dijkstra's two stack algorithm for arithmetic expression evaluation

Following concepts are explained in this video, - A brief introduction to data structures - What are stacks? Stack as an abstract data type - Real time examples of stack implementation. A demonstration of browser back button implementation of stacks -Dijkstra's two stack algorithm for arithmetic expression evaluation explained with examples and java program Blog link for executable code, https://logicfirstcoding.com/understanding-stacks-with-dijkshtras-two-stack-algorithm-for-arithmetic-expression-evaluation/