There are a lot of youtube videos by famous miners/traders/investorsexplaining all the pros and cons about bitconnect. you can watch them to know more about bitconnect.
Bellow i quoted from their website of what bitconnect is all about

Bitconnect is an open source, peer-to-peer, community driven decentralized cryptocurrency that allow people to store and invest their wealth in a non-government controlled currency, and even earn a substantial interest on investment. This means anyone holding BitConnect Coin in their wallet will receive interest on their balance in return for helping maintain security of the network.
This means anyone holding BitConnect Coin in their wallet will receive interest on their balance in return for helping maintain security of the network". a lending platform interest on investment thats their main idea
but they are operating in
4 Business Model 1.
Lending:Bitconnect also offers the option to invest BCC via a special lending platform and this involves using the Bitconnect trading bot and volatility software. Lenders are promised to receive daily profit based on their investment option with the following options available.
2.
Staking:Bitconnect allows users who have purchased BBC to accrue interest and promises returns of up to 120% per year through PoS minting. Users who hold coins in a Bitconnect-QT wallet will receive interest on their balance.
3.
Trading:BCC holders can also trade the coin and try to profit by selling them at a higher price and buying them back at a lower price. Investors are prompted to use Bitcoin to purchase BCC from the BCC exchange.
4.
Mining:BCC can be mined with CPU/GPU equipment and miners can choose to work via a BCC Solo Mining Proof of Work system or through the BCC Pool Mining system.