Google Ads shared budgets allow advertisers to share a single budget across multiple campaigns in their account. Some key things to know about shared budgets in Google Ads:

Shared budgets help coordinate spending across multiple campaigns, rather than each campaign having its own individual budget. Instead of setting campaign-level budgets, the shared budget is set at the account level and used across campaigns. You can assign multiple campaigns to utilize segments of the same shared budget.

In summary, Google Ads shared budgets provide an account-level coordinated budget to efficiently spend across multiple campaigns, rather than budgeting each one individually. It's about flexibility and control over account-level spending.