Capital Gains Tax is a tax on the profit when you sell (or 'dispose of') something (an 'asset') that's increased in value. It's the gain you make that's taxed, not the amount of money you receive.
A broad range of assets are subject to this tax, e.g. buy-to-let property, Shares & Investments not held in ISAs, but also art (paintings, sculpture etc.).
Giving away an asset can still generate a Capital Gains charge.
Each individual has an annual exemption (£11,100 in 2016/2017 & £11,300 in 2017/2018) and transfers between husband and wife, or civil partners, are treated as no gain and no loss (transfer can be made without creating a Capital Gains Tax charge)
Although some items are exempt (e.g. cars), many assets are chargeable and we can provide professional help to ensure you comply with all the rules.