Anti-dilution terms are required in order to protect Investors from the dilution of equity when shares are issued at a later date and at cheaper prices than when those investors had originally paid.

How it applies to Startup/Investor and its impact: 

An anti-dilution provision is essential in order to shield an investor from the possibility of their equity holdings becoming diluted over time. They are a form of subscription rights or privileges for investors.

Further details on types of Anti-Dilution available here –

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