%% Marketing Cloud Engagement reference architecture
%% Reference architecture: a reusable pattern, not a live client integration
flowchart TB
  subgraph z0["Your Salesforce org"]
    crm["Salesforce CRM<br/>Sales or Service Cloud"]
  end
  subgraph z1["Marketing Cloud Engagement account"]
    mcc["Marketing Cloud Connect<br/>managed package in CRM"]
    auto["Automation Studio<br/>imports, SQL, scripts"]
    api["Journey and send APIs<br/>entry events, transactional"]
    cb["Contact Builder<br/>Data Designer, Contact Key"]
    de["Data extensions<br/>sendable and relational"]
    content["Content Builder<br/>AMPscript, content blocks"]
    jb["Journey Builder<br/>multi-step journeys"]
    send["Send management<br/>profiles, classifications"]
    track["Tracking and data views<br/>sends, opens, clicks, bounces"]
    pages["CloudPages<br/>landing pages, forms"]
  end
  files["External files<br/>SFTP drops"]
  apps["Apps and websites<br/>API events"]
  email["Email<br/>authenticated domain"]
  sms["SMS<br/>MobileConnect"]
  push["Push<br/>MobilePush SDK"]
  crm -->|"object sync"| mcc
  files -->|"file drop"| auto
  apps -->|"API events"| api
  mcc -->|"synchronized DEs"| de
  auto -->|"imports and SQL"| de
  api -->|"entry event data"| de
  de -->|"linked attributes"| cb
  cb -->|"audiences"| jb
  content -->|"templates"| send
  jb -->|"email and SMS activities"| send
  send -->|"email sends"| email
  jb -->|"SMS activities"| sms
  jb -->|"push activities"| push
  email -->|"engagement events"| track
  pages -.->|"form submit entry"| jb
  track -.->|"tracking write-back"| mcc
  classDef salesforce stroke:#125BD8,fill:#e8f0fd
  class crm salesforce
  classDef data stroke:#2f8a3a,fill:#e9f6ea
  class cb,de,track data
  classDef engagement stroke:#5747AF,fill:#efedfa
  class auto,content,jb,send engagement
  classDef integration stroke:#334155,fill:#eef2f6
  class mcc,api integration
  classDef channel stroke:#2f8a3a,fill:#ffffff
  class email,sms,push,pages channel
  classDef external stroke:#64748b,fill:#ffffff
  class files,apps external