Crypto tokens are used in a variety of applications, from fundraising to decentralized finance (DeFi) and beyond.

Crypto tokens are built on top of existing blockchain networks, such as Ethereum or Binance Smart Chain. They are created through a process called tokenization, which involves turning a real-world asset into a digital token that can be traded and owned on a blockchain network.

In simple terms - Crypto tokens are digital assets built on top of an existing blockchain. 

Tokens can be categorized into two types: utility tokens and security tokens. Utility tokens are used to access a specific service or product, such as a platform or a service. Security tokens, on the other hand, are tokens that represent ownership of a specific asset or investment opportunity, such as a share in a company or a real estate investment.

Crypto tokens have become increasingly popular in recent years as a means of fundraising. Initial Coin Offerings (ICOs) and Initial Exchange Offerings (IEOs) have become a popular way for companies to raise funds by offering tokens to investors. These tokens can be used to access the company's products or services, or they can be traded on a cryptocurrency exchange.

In addition to fundraising, crypto tokens are used in DeFi applications. DeFi is a new type of financial system that is built on blockchain technology. It aims to provide a decentralized alternative to traditional financial systems by using smart contracts and crypto tokens to create financial products and services.

One of the most popular DeFi applications is decentralized exchanges (DEXs). These are platforms that allow users to trade cryptocurrencies without the need for a centralized intermediary. DEXs use crypto tokens as the medium of exchange and offer a wide range of trading pairs.

Crypto tokens are also used in lending and borrowing applications, where users can borrow or lend cryptocurrency using smart contracts. These smart contracts use crypto tokens as collateral, which ensures that borrowers have an incentive to repay their loans.

Another popular use case for crypto tokens is in the gaming industry. Crypto tokens are used as in-game currency, allowing players to buy and sell virtual goods and services. This has led to the rise of blockchain-based gaming platforms that use crypto tokens as the primary means of exchange.

Crypto tokens have many advantages over traditional financial systems. They are decentralized, which means that they are not controlled by a single entity, such as a government or a bank. This makes them more resilient to censorship and manipulation. They are also transparent, which means that all transactions are recorded on a public blockchain ledger that can be easily audited.

However, crypto tokens also have some disadvantages. They are still a relatively new technology, and their legal status is still uncertain in many jurisdictions. 

In conclusion, crypto tokens are digital assets that are built on top of blockchain technology. They are used in a variety of applications, from fundraising to DeFi and gaming. Crypto tokens have many advantages over traditional financial systems, but they also have some disadvantages. As the technology continues to evolve, it is likely that crypto tokens will become more widely adopted and integrated into our daily lives.