From the Summary: "Budgeting for the federal government is an enormously complex process. It entails dozens of subprocesses, countless rules and procedures, the efforts of tens of thousands of staff persons in the executive and legislative branches, millions of work hours each year, and the active participation of the President and congressional leaders, as well as other Members of Congress and executive officials. […] The Congressional Budget Act of 1974 establishes the congressional budget process as the means by which Congress coordinates the various budget-related actions (such as the consideration of appropriations and revenue measures) taken by it during the course of the year. The process is centered around an annual concurrent resolution on the budget that sets aggregate budget policies and functional spending priorities for at least the next five fiscal years. Because a concurrent resolution is not a law -- it cannot be signed or vetoed by the President -- the budget resolution does not have statutory effect; no money can be raised or spent pursuant to it. Revenue and spending amounts set in the budget resolution establish the basis for the enforcement of congressional budget policies through points of order. Congress implements budget resolution policies through action on individual revenue and debt-limit measures, annual appropriations acts, and direct spending legislation. In some years, Congress considers reconciliation legislation pursuant to reconciliation instructions in the budget resolution. Reconciliation legislation is used mainly to bring existing revenue and direct spending laws into conformity with budget resolution policies Initially, reconciliation was a major tool for deficit reduction; in recent years, reconciliation has been used mainly to reduce revenues."
CRS Report for Congress, 98-721