This is the retirement account everyone is familiar with. 401(k) accounts are available through your employer. Contributions come out of your paycheck before taxes are withheld, which allows for greater contributions. Growth within the account is also tax-free. However, you must pay personal income tax on money that you withdraw.
You are allowed to contribute a maximum of $19,500 per year. Employers are allowed to contribute up to $57,000 per year on your behalf -- so any "match" your company provides as a perk goes in a separate bucket and does not count against the limit that you yourself can contribute.