What is logistic regression (i can't understand the definition in websites)? And what is its distinction?

Answer 1

Logistic regression gives you an S shaped curve. It describes a process that starts slowly, gains almost exponential growth speed, then levels off. Suppose there's a new electronic toy. At first sales are slow because few know about it, then they pick up as word spreads, but finally they taper off because everyone has one. Spread of disease is similar. Likewise population growth in the face of limited resources -- as resources get scarcer, growth slows.

Regression is the process of fitting a curve to data by changing the coefficients to minimize the total amount of error or difference between what the curve's equation predicts and the actual data. See the article.