Utilize your financial knowledge, give your answer or opinion to the input question or subject . Answer format is not limited.

What is the difference between fund and portfolio?
A "Fund" is generally speaking a collection of similar financial products, which are bundled into a single investment, so that you as an individual can buy a portion of the Fund rather than buying 50 portions of various products. e.g. a "Bond Fund" may be a collection of various corporate bonds that are bundled together. The performance of the Fund would be the aggregate of each individual item. Generally speaking Funds are like pre-packaged "diversification". Rather than take time (and fees) to buy 50 different stocks on the same stock index, you could buy an "Index Fund" which represents the values of all of those stocks. A "Portfolio" is your individual package of investments. ie: the 20k you have in bonds + the 5k you have in shares, + the 50k you have in "Funds" + the 100k rental property you own. You might split the definition further buy saying "My 401(k) portfolio & my taxable portfolio & my real estate portfolio"(etc.), to denote how those items are invested. The implication of "Portfolio" is that you have considered how all of your investments work together; ie: your 5k in stocks is not so risky, because it is only 5k out of your entire 185k portfolio, which includes some low risk bonds and funds. Another way of looking at it, is that a Fund is a special type of Portfolio. That is, a Fund is a portfolio, that someone will sell to someone else (see Daniel's answer below). For example: Imagine you had $5,000 invested in IBM shares, and also had $5,000 invested in Apple shares. Call this your portfolio. But you also want to sell your portfolio, so let's also call it a 'fund'. Then you sell half of your 'fund' to a friend. So your friend (let's call him Maurice) pays you $4,000, to invest in your 'Fund'. Maurice gives you $4k, and in return, you given him a note that says "Maurice owns 40% of atp9's Fund".  The following month, IBM pays you $100 in dividends. But, Maurice owns 40% of those dividends. So you give him a cheque for $40 (some funds automatically reinvest dividends for their clients instead of paying them out immediately). Then you sell your Apple shares for $6,000 (a gain of $1,000 since you bought them). But Maurice owns 40% of that 6k, so you give him $2,400 (or perhaps, instead of giving him the money immediately, you reinvest it within the fund, and buy $6k of Microsoft shares). Why would you set up this Fund? Because Maurice will pay you a fee equal to, let's say, 1% of his total investment. Your job is now to invest the money in the Fund, in a way that aligns with what you told Maurice when he signed the contract. ie: maybe it's a tech fund, and you can only invest in big Tech companies. Maybe it's an Index fund, and your investment needs to exactly match a specific portion of the New York Stock Exchange. Maybe it's a bond fund, and you can only invest in corporate bonds. So to reiterate, a portfolio is a collection of investments (think of an artist's portfolio, being a collection of their work). Usually, people refer to their own 'portfolio', of personal investments. A fund is someone's portfolio, that other people can invest in. This allows an individual investor to give some of their decision making over to a Fund manager. In addition to relying on expertise of others, this allows the investor to save on transaction costs, because they can have a well-diversified portfolio (see what I did there?) while only buying into one or a few funds.