I am in the crypto currency investment since 2017,I uses electrum wallet for storing the bitcoin but I want to know why the people using bitcoin mixers is this to make anonymous transactions? Just help me to understand it clearly.
The purpose of mixer is to ensure that the origin and the destination cannot be traced by the anyone. Transactions aren't really made anonymous through this but it makes it difficult for people to trace the coins back to the origin, without sophisticated analysis (if the mixer isn't good). Some people use it to circumvent certain restrictions tied to their online wallet (eg. Coinbase restricts transactions from gambling sites).
If you want to try a mixer, try Chipmixer. It's pretty reliable from my personal experience.