Market Share::The percentage of an industry or market's total sales that is earned by a particular company over a specified time period.

Market growth ::An increase in the demand for a particular product or service over time.

It is right to to say that twix chocolate bar has a 26% market share.

Market share is the percentage of total sales of a certain kind of product or service?

Market growth is the increase/ decrease in demand for a particular product or service over a period of time?

Also, is it right for me to say that for instance twix chocolate bar has a 26% (not correct, just an example) market share out of the whole chocolate market?

I'm really confused and would appreciate any help, thanks