Inflation is a loss of purchasing power — each dollar, euro, etc., buys less than it did before. This can happen in different ways, even if prices don't change.
shrinkflation — less product for the same price. Have you ever bought something and found less inside than you expected? It might not be just your imagination.
skimpflation — lower quality for the same price. Airlines or hotels, for example, quietly stop offering services while charging customers the same as before.
greedflation — prices rise unnecessarily. Some companies may take advantage of the fact that inflation is now expected.
stagflation — a combination of "stagnation" and "inflation". This happens when both inflation and unemployment are high.
core inflation — excludes food and energy prices, which are volatile. This makes long-term trends in prices easier to see.