The main difference between single malt and blended Scotch whisky is in the way they are produced.
Single malt Scotch whisky is made from 100% malted barley and is produced at a single distillery. It is aged in oak casks for a minimum of three years and is bottled without the addition of any other whiskies. Single malt Scotch whisky is known for its complex flavors and aromas, which are influenced by the location of the distillery and the type of cask used for aging.
Blended Scotch whisky, on the other hand, is made by blending together two or more single malt whiskies from different distilleries with grain whisky. Grain whisky is made from grains such as wheat or corn and is typically distilled using a continuous process. Blended Scotch whisky is designed to have a consistent flavor profile and is often aged for a shorter period than single malt Scotch whisky.
Overall, single malt Scotch whisky is considered to be of higher quality and is often more expensive than blended Scotch whisky, although this is not always the case. The choice between single malt and blended Scotch whisky ultimately comes down to personal preference and taste.