Can You Explain Short Run Equilibrium Under Perfect Competition?

You Explain Short Run Equilibrium Under Perfect Competition with diagram?

Explain in theory and show the diagram in terms of prices,demand,supply,cost and profits

Short run is a period of time in which a firm can not changes its all variables . In the short run a firm is equilibrium at that firm where marginal cost is equal to marginal revenue.marginal cost is a change in total cost attributed to a one unit change in the level of output.
Similarly marginal revenue is a change in total revenue attribute a one unit change in the level of out put

It is action in which a firm can't change of his products