A family of Microsoft word processing software products for creating web, email, and print documents.
By default, Ctrl+Shift+C copies text formatting and Ctrl+Shift+V pastes it. Although this is sometimes useful, applying styles to text will ensure more consistent formatting; see https://shaunakelly.com/word/styles/tipsonstyles.html.
As Rohn pointed out, pasting in plain text format is a different function. You can do it via the Paste Special dialog box or by choosing Keep Text Only from the Paste Options button which appears by default as you paste content in a Word document: